JP4278943B2

JP4278943B2 - Cellulose-based powder-containing extruded shape and method for producing the same

Info

Publication number: JP4278943B2
Application number: JP2002277766A
Authority: JP
Inventors: 雅樹若林; 石橋　　亮; 守田中
Original assignee: ＹｋｋＡｐ株式会社
Priority date: 2002-09-24
Filing date: 2002-09-24
Publication date: 2009-06-17
Anticipated expiration: 2022-09-24
Also published as: JP2004114356A

Description

【０００１】
【発明の属する技術分野】
本発明はセルロース系粉体含有押出形材及びその製造方法に関し、さらに詳しくは、表層部の材料によって中心部の材料の周囲が一体的に被覆されていると共に、意匠性に優れる外観を有し、またサンディング等の簡単な表面処理により木目様の模様を容易に作出することができるセルロース系粉体含有押出形材及びその製造方法に関するものである。
【０００２】
【従来の技術】
従来からこの種のセルロース系粉体含有押出形材の開発は種々行なわれ、特に充填材にセルロース系粉体を用いることは木屑、木質系建築廃材、古紙等の資源の再利用を図るために有効な方法である。また、セルロース系粉体含有押出形材のセルロース系粉体の割合を多くし、ポリオレフィンの割合を少なくすることが経済的に有利であり、さらに木粉が多くなるに従って、優れた木質感が得られる。このような組成のセルロース系粉体含有複合樹脂成形品は、例えば、特許文献１に開示されている。
【０００３】
しかしながら、前記セルロース系粉体含有押出形材に用いられる材料においては、表層部や中心部の区別がなく、中心部にも意匠性に優れる表層部と同様の配合の材料を用いていたため、使用できる材料に制限があった。また、表層部に意匠性を有する材料を用い、中心部に意匠性を必要としない材料を用いても、表層部の成形加工時の材料の粘度が中心部の材料の粘度と同じか或いは高いと、表層部の材料が中心部の材料の周囲を被覆することが困難である。仮に押出成形時の加圧力を高めて無理やり被覆しようとした場合、中心部の形態がいびつになるため、変形したり強度的に均一なものが得られないという問題があった。
【０００４】
【特許文献１】
特公昭５９−３０１７６号公報（特許請求の範囲）
【０００５】
【発明が解決しようとする課題】
本発明は、前記したような問題に鑑みなされたものであり、その目的は、表層部の材料の成形加工性に優れ、容易に中心部の材料の周囲を被覆することができると共に、意匠性に優れる外観を有し、またサンディング等の簡単な表面処理により木目様の模様を容易に作出することができ、消費者のニーズに充分に対応可能なセルロース系粉体含有押出形材、及びこのようなセルロース系粉体含有押出形材を生産性よく低コストで製造できると共に、表層部として装飾性を備えた組成の材料を被覆することで、中心部に原料自体が既に種々の顔料や染料で着色されている廃材や再生樹脂の粉体や、粒径及び／又は種類の異なる粉体を混合して用いることができ、資源の有効利用や地球環境保護に資することができる方法を提供することにある。
【０００６】
【課題を解決するための手段】
前記目的を達成するために、本発明によれば、少なくとも樹脂（Ａ）とセルロース系粉体（Ｂ）とを含み、その厚みが０．５〜３ｍｍである表層部と、少なくとも樹脂（Ａ）とセルロース系粉体及び／又は無機系粉体（Ｂ’）とを含む中心部とが共押出により一体的に押出成形されてなるセルロース系粉体含有押出形材であって、上記表層部及び中心部が共に、さらに不飽和カルボン酸もしくはその誘導体で変性されたポリオレフィン樹脂を含有しており、中心部の組成が表層部とは異なると共に、上記表層部の成形加工時の材料の粘度が、上記中心部の成形加工時の材料の粘度よりも低く、かつ、上記中心部の材料の粘度が１００〜１００００Ｐａ・ｓ、表層部の材料の粘度が５０〜９９００Ｐａ・ｓであることを特徴とするセルロース系粉体含有押出形材が提供される。
好適な態様においては、表層部は、樹脂（Ａ）とセルロース系粉体（Ｂ）とをＡ：Ｂ＝９０〜１０：１０〜９０の比率（質量比）で含む。中心部は、樹脂（Ａ）とセルロース系粉体及び／又は無機系粉体（Ｂ’）とをＡ：Ｂ’＝９０〜１０：１０〜９０の比率（質量比）で含む。また、別の好適な態様においては、前記表層部はさらに無機系粉体を含有しており、かつ、中心部に含まれるセルロース系粉体が表層部に含まれるセルロース系粉体とは異なる種類及び／又は粒径からなり、又は、中心部に含まれる無機系粉体が表層部に含まれる上記無機系粉体とは異なる種類及び／又は粒径からなる。
【０００７】
さらに本発明によれば、前記セルロース系粉体含有押出形材の製造方法も提供され、その基本的な態様は、１３０℃で測定したときの揮発成分が０．５質量％以下となるように調整したセルロース系粉体を、樹脂、好ましくは再生ポリオレフィン等の再生樹脂、及び不飽和カルボン酸もしくはその誘導体で変性されたポリオレフィン樹脂、あるいはさらに無機系粉体と共に混合及び／又は混練し、表層部の材料と中心部の材料が共に上記不飽和カルボン酸もしくはその誘導体で変性されたポリオレフィン樹脂を含有しており、かつ、粘度が１００〜１００００Ｐａ・ｓである中心部の材料と、粘度が５０〜９９００Ｐａ・ｓである表層部の材料からなる成形加工時の粘度が異なる２種の材料を調製し、相対的に成形加工時の材料の粘度が低い表層部と成形加工時の材料の粘度が高い中心部とを共押出により一体的に押出成形し、少なくとも樹脂（Ａ）とセルロース系粉体（Ｂ）と不飽和カルボン酸もしくはその誘導体で変性されたポリオレフィン樹脂とを含み、その厚みが０．５〜３ｍｍである表層部と、少なくとも樹脂（Ａ）とセルロース系粉体及び／又は無機系粉体（Ｂ’）と不飽和カルボン酸もしくはその誘導体で変性されたポリオレフィン樹脂とを含む中心部とが一体的に押出成形されてなり、かつ、中心部の組成が表層部とは異なるセルロース系粉体含有押出形材を製造することを特徴としている。
【０００８】
【発明の実施の形態】
本発明者らは、前記した課題を達成すべく鋭意研究した結果、セルロース系粉体含有押出形材の製造において、セルロース系粉体を含む表層部の成形加工時の材料の粘度がセルロース系粉体及び／又は無機系粉体を含む中心部の成形加工時の材料の粘度よりも低い場合、表層部の材料の成形加工性に優れ、容易に中心部の材料の周囲を被覆することができ、意匠性に優れる外観を有すると共にサンディング等の簡単な表面処理により木目様の模様を容易に作出することができ、消費者のニーズに充分に対応可能なセルロース系粉体含有押出形材が得られること、また、表層部として装飾性を備えた組成の材料を被覆することで、中心部に原料自体が既に種々の顔料や染料で着色されている廃材や再生樹脂の粉体や、粒径及び／又は種類の異なる粉体を混合して用いることができ、セルロース系粉体含有押出形材を生産性よく低コストで製造できると共に、資源の有効利用や地球環境保護に資することができることを見出し、本発明を完成するに至ったものである。ここでいう「廃材」とは、セルロース系粉体含有押出形材や木材製品の廃棄物をいい、「再生樹脂」とは、いわゆるリサイクル樹脂のことで、既に一回以上使用された成形加工品等を回収したもの、或いは成形加工工程で発生する不良品や端材等をいう。
【０００９】
本明細書において、「成形加工時の粘度」とは成形加工温度（押出温度）における材料の粘度をいい、例えば「ＪＩＳＫ７１９９熱可塑性プラスチックのキャピラリーレオメータによる流れ特性試験方法」によって測定される。また、その際に用いる装置としては東洋精機製キャピログラフ等が用いられ、その測定条件の一例としては、測定温度（押出温度）１８０℃、剪断速度：６０８ｓｅｃ^−１を採用できるが、２種の材料の粘度を客観的に相対評価できる条件であればよい。また、本発明において、中心部及び表層部の具体的粘度は、中心部の材料の粘度が１００〜１００００Ｐａ・ｓであり、表層部の材料の粘度が５０〜９９００Ｐａ・ｓである。
【００１０】
セルロース系粉体を含む表層部の成形加工時の材料の粘度を、セルロース系粉体及び／又は無機系粉体を含む中心部の成形加工時の材料の粘度よりも低くするための方法としては、如何なる方法であってもよく、例えば、母材樹脂に粘度そのものが低い樹脂を用いる方法、滑剤を加える方法、木粉等のセルロース系粉体の充填量を少なくする方法、充填する木粉等に粒径の小さいものを用いる方法等が挙げられ、これらの手段を単独で又は組み合わせて採用することができる。さらに、中心部に粒径の大きいセルロース系粉体を用い、表層部に粒径の小さいセルロース系粉体を用いた場合、表層部の粘度の低下に加えて、表層部に粒径の大きいセルロース系粉体を用いたセルロース系粉体含有押出形材の場合のように、屋外等で使用した際の雨水等によって表面に露出した木粉の吸水乾燥に伴う膨張収縮によるセルロース系粉体の脱落や、表面の質感の変化、汚れ等の付着を防止し、或いは目立たなくすることができる。
【００１１】
本発明のセルロース系粉体含有押出形材においては、サンディング等の簡単な表面処理によりセルロース系粉体が表面に露出するので、木目様の模様を容易に作出することができるが、表面層の厚みは、０．５〜３ｍｍが好ましい。表面層が０．５ｍｍよりも薄いと、表面樹脂層をサンディング等により除去した場合、中心部が露出し、装飾性が損なわれる恐れがあり、一方、３ｍｍよりも厚いと経済的に不利となる。
【００１２】
以下、本発明のセルロース系粉体含有押出形材の各構成成分について説明すると、中心部は少なくとも樹脂とセルロース系粉体及び／又は無機系粉体と不飽和カルボン酸もしくはその誘導体で変性されたポリオレフィン樹脂を含む材料、表層部は少なくとも樹脂とセルロース系粉体と不飽和カルボン酸もしくはその誘導体で変性されたポリオレフィン樹脂を含む材料よりなる。
【００１３】
前記セルロース系粉体としては如何なるものであってもよく、例えば木粉、竹粉、パルプ、バカス、ケナフ、おが屑、木質繊維、籾殻、破砕チップ材、果実穀粉、古紙等が挙げられ、単独で又は２種類以上を組み合わせて用いることができる。一方、前記無機系粉体としては如何なるものであってもよく、例えば水酸化物、酸化物、無機塩、ケイ酸化合物等が挙げられ、単独で又は２種類以上を組み合わせて用いることができる。
本発明のセルロース系粉体含有押出形材の中心部には、セルロース系粉体及び／又は無機系粉体を単独で又は２種類以上を組み合わせて用いることができ、表層部には前記セルロース系粉体を単独で又は２種類以上を組み合わせて用いることができる。表層部に用いるセルロース系粉体としては、特に木粉を用いることが好ましい。
【００１４】
また、セルロース系粉体及び／又は無機系粉体が水分等の揮発成分を含んでいると、これが加工工程で発泡し、製品不良の原因となる。そのため、セルロース系粉体及び／又は無機系粉体が揮発成分を含んでいる場合、予め乾燥して、１３０℃で測定したときの揮発成分が０．５質量％以下となるように調整することが好ましい。
【００１５】
前記樹脂としては、熱可塑性樹脂であれば如何なるものであってもよいが、特にポリオレフィンが好ましい。ポリオレフィンとしては、如何なるものであってもよく、例えば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、ポリプロピレン、ポリスチレン、ポリ酢酸ビニル、ポリ塩化ビニル、ポリ塩化ビニリデン、ポリアクリル酸、ポリアクリル酸塩、ポリアクリル酸エステル、ポリブタジエン、ポリイソプレン、ポリクロロプレン、エチレンプロピレンゴム、アクリロニトリル−ブタジエン−スチレン共重合体、アクリロニトリル−エチレンプロピレンゴム−スチレン共重合体、エチレン酢酸ビニル共重合体等が挙げられ、これらを単独で又は２種以上を組み合わせて用いることができる。これらポリオレフィンの中でも、特に、安価で工業的に量産性があること、軽量でかつ剛性に優れ、比較的耐熱性が良好なこと、及び成形性が良いことからポリプロピレンが好適である。
【００１６】
セルロース系粉体含有押出形材における表層部は、樹脂（Ａ）とセルロース系粉体（Ｂ）とをＡ：Ｂ＝９０〜１０：１０〜９０、好ましくは７０〜３０：３０〜７０の比率（質量比）で含むことが適当である。表層部でセルロース系粉体が樹脂との組成比率で１０：９０よりも少なくなると、添加するセルロース系粉体の配合量が少なく天然に近い木質感が極端に損なわれるので好ましくない。一方、セルロース系粉体が樹脂との組成比率で９０：１０よりも多くなると、樹脂がセルロース系粉体及び／又は無機系粉体の各部周囲に回り切らないため、強度に問題のあるセルロース系粉体含有押出形材が得られるので好ましくない。
【００１７】
一方、セルロース系粉体含有押出形材における中心部は、樹脂（Ａ）とセルロース系粉体及び／又は無機系粉体（Ｂ’）とをＡ：Ｂ’＝９０〜１０：１０〜９０、好ましくは７０〜３０：３０〜７０の比率（質量比）で含むことが適当である。中心部でセルロース系粉体及び／又は無機系粉体が樹脂との組成比率で１０：９０よりも少なくなると、比較的に高価な樹脂の配合量が多く経済的に不利になるので好ましくない。一方、セルロース系粉体及び／又は無機系粉体が樹脂との組成比率で９０：１０よりも多くなると、樹脂がセルロース系粉体及び／又は無機系粉体の各部周囲に回り切らないため、強度に問題のあるセルロース系粉体含有押出形材が得られるので好ましくない。
【００１８】
なお、本発明においては、前記各成分の他に、セルロース系粉体と樹脂、特にポリオレフィンとの親和性を向上させるための不飽和カルボン酸もしくはその誘導体で変性されたポリオレフィン樹脂を添加し、また必要に応じて、着色剤等の各種添加剤を加えることができる。上記不飽和カルボン酸としては、如何なるものであってもよく、例えば無水マレイン酸、無水イタコン酸、無水シトラコン酸、マレイン酸、イタコン酸、シトラコン酸、クロトン酸、イソクロトン酸、メサコン酸、アンゲリカ酸、ソルビン酸、アクリル酸、メタクリル酸等が挙げられ、これらを単独で又は２種類以上を組み合わせて用いることができる。また、上記不飽和カルボン酸の誘導体としては、如何なるものであってもよく、上記不飽和カルボン酸の金属塩、アミド、イミド、エステル等のうちの１つ或いは２種類以上を組み合わせて用いることができる。
【００１９】
着色剤としては、如何なるものであってもよく、例えば二酸化チタン、酸化コバルト、群青、紺青、弁柄、銀朱、鉛白、鉛丹、黄鉛、ストロンチウムクロメート、チタニウムイエロー、チタンブラック、ジンククロメート、鉄黒、モリブデン赤、モリブデンホワイト、リサージ、リトポン、カーボンブラック、エメラルドグリーン、ギネー緑、カドミウム黄、カドミウム赤、コバルト青、アゾ顔料、フタロシアニンブルー、イソインドリノン、キナクリドン、ジオキサジンバイオレット、ペリノンペリレン等が挙げられ、これらを単独で又は２種類以上を組み合わせて用いることができる。
その他必要に応じて、酸化防止剤、紫外線吸収剤、光安定剤、帯電防止剤、滑剤、難燃剤等の各種添加剤を加えることができる。
【００２０】
本発明のセルロース系粉体含有押出形材の製造に当っては、前記したように１３０℃で測定したときの揮発成分が０．５質量％以下となるように予め乾燥工程等によって調整したセルロース系粉体を、樹脂、好ましくは再生ポリオレフィン等の再生樹脂、不飽和カルボン酸もしくはその誘導体で変性されたポリオレフィン樹脂、及び必要に応じて無機系粉体や他の添加剤と共に混合及び／又は混練し、成形加工時の粘度が異なる２種の材料を調製する。次いで、相対的に成形加工時の材料の粘度が低い表層部と成形加工時の材料の粘度が高い中心部とを、共押出法により一体的に押出成形することよって製造することができる。
【００２１】
前記のような方法により製造されたセルロース系粉体含有押出形材の幾つかの例を図１〜５に示す。図１乃至図３は板状成形品を示しており、図１に示す板状成形板１は中心部２の側周全表面が表層部３で一体的に被覆されており、図２では中心部２の上面のみ、図３では上面と一側面が表層部３で一体的に被覆されている。一方、図４及び図５は中空部４を有する板状成形品１ａを示しており、図４では中心部２の上面のみ、図５では上面と下面が表層部３で一体的に被覆されている。当然のことながら、本発明はこれらの態様に限定されるものではなく、各種形状、構造のセルロース系粉体含有押出形材を製造できる。
【００２２】
また、得られた押出形材は、サンディング等の簡単な表面処理により木目様の模様を容易に作出することができ、さらには、研削、研磨、切断、彫刻等の加工を施すことによって、サッシ、枠材、壁材、床材、ドア、パネル、笠木、腰板、すのこ、濡れ縁、額縁、デッキ材、屋根、しきり板、雨戸、雨どい、柱、柱カバー、つき板、室内建具用框材及び枠材、花壇、フェンス、ベンチ、門扉、看板、ルーバー、手すり等の製品に仕上げることができる。
【００２３】
【実施例】
以下、実施例及び比較例を示して本発明についてより具体的に説明するが、もちろん本発明は、下記実施例によって何ら限定されるものではない。尚、とくに断りの無い限り、実施例に記載の「部」は「質量部」を示す。下記実施例及び比較例において、押出機としては二軸押出機、単軸押出し機、多軸押出し機或いはその組み合わせのいずれを用いてもよい。さらに、押出機に用いられるスクリュー形状もとくに制限はない。
【００２４】
実施例１
１３０℃で測定したときの揮発成分が０．５質量％以下となるように乾燥した７０ｗｔ％以上が１００メッシュを通過する粒径の木粉１２２部、再生ポリプロピレン１００部、添加剤である無水マレイン酸変性ポリプロピレン１部と顔料１２部を加え、ヘンシェルミキサーで混練し、表層部に用いるコンパウンドを得た。得られたコンパウンドをクラッシャーによって粉砕し、粒径を調整した。また、１３０℃で測定したときの揮発成分が０．５質量％以下となるように乾燥した１００メッシュを３０ｗｔ％以上通過しない粒径が不揃いな木粉１２２部、表層部に用いた材料と同様の再生ポリプロピレン１００部、添加剤である無水マレイン酸変性ポリプロピレン１部からなるコンパウンドを中心部に用いた。中心部に用いたコンパウンドは、表層部に用いたコンパウンドと同様の方法によって作成した。それぞれのコンパウンドを用い、共押出を行なった。以上の方法により、本発明に係るセルロース系粉体含有押出形材を作製した。
【００２５】
実施例２〜５
実施例１において、中心部に用いるコンパウンド中の木粉の粒径を変更した以外は、実施例１と同様の押出条件及び操作を行なうことにより、本発明に係るセルロース系粉体含有押出形材を作製した。
【００２６】
前記実施例１〜５で用いた主要材料及び成形加工時の粘度を表１にまとめて示す。
【表１】

前記実施例１〜５において、セルロース系粉体を含む表層部の成形加工時の材料の粘度が無機系粉体及び／又はセルロース系粉体を含む中心部の成形加工時の材料の粘度よりも低いため、表層部の材料の成形加工性に優れ、容易に中心部の材料の周囲を被覆することができた。
【００２７】
実施例６
１３０℃で測定したときの揮発成分が０．５質量％以下となるように乾燥した７０ｗｔ％以上が１００メッシュを通過する粒径の木粉１２２部、再生ポリプロピレン１００部、添加剤である無水マレイン酸変性ポリプロピレン１部と顔料１２部を加え、ヘンシェルミキサーで混練し、表層部に用いるコンパウンドを得た。得られたコンパウンドをクラッシャーによって粉砕し、粒径を調整した。また、１３０℃で測定したときの揮発成分が０．５質量％以下となるように乾燥した７０ｗｔ％以上が１００メッシュを通過する粒径の木粉１２２部、表層部に用いた樹脂よりも粘度が高い再生ポリプロピレン１００部、添加剤である無水マレイン酸変性ポリプロピレン１部からなるコンパウンドを中心部に用いた。中心部に用いたコンパウンドは、表層部に用いたコンパウンドと同様の方法によって作成した。それぞれのコンパウンドを用い、共押出を行なった。以上の方法により、中心部の周囲を表層部が一体的に被覆するように押出成形された本発明に係るセルロース系粉体含有押出形材を作製した。
【００２８】
実施例７
１３０℃で測定したときの揮発成分が０．５質量％以下となるように乾燥した７０ｗｔ％以上が１００メッシュを通過する粒径の木粉１２２部、再生ポリプロピレン１００部、添加剤である無水マレイン酸変性ポリプロピレン１部と顔料１２部を加え、ヘンシェルミキサーで混練し、表層部に用いるコンパウンドを得た。得られたコンパウンドをクラッシャーによって粉砕し、粒径を調整した。また、１３０℃で測定したときの揮発成分が０．５質量％以下となるように乾燥した１００メッシュを３０ｗｔ％以上通過しない粒径が不揃いな木粉１２２部、既に着色された表層部よりも粘度の高い再生ポリプロピレン１００部、添加剤である無水マレイン酸変性ポリプロピレン１部からなるコンパウンドを中心部に用いた。中心部に用いたコンパウンドは、表層部に用いたコンパウンドと同様の方法によって作成した。それぞれのコンパウンドを用い、共押出を行なった。以上の方法により、中心部の周囲を表層部が一体的に被覆するように押出成形された本発明に係るセルロース系粉体含有押出形材を作製した。
【００２９】
実施例８
１３０℃で測定したときの揮発成分が０．５質量％以下となるように乾燥した７０ｗｔ％以上が１００メッシュを通過する粒径の木粉１２２部、再生ポリプロピレン１００部、添加剤である無水マレイン酸変性ポリプロピレン１部と顔料１２部、滑剤０．３部を加え、ヘンシェルミキサーで混練し、表層部に用いるコンパウンドを得た。得られたコンパウンドをクラッシャーによって粉砕し、粒径を調整した。また、１３０℃で測定したときの揮発成分が０．５質量％以下となるように乾燥した１００メッシュを３０ｗｔ％以上通過しない粒径が不揃いな木粉１２２部、既に着色された表層部よりも粘度の高い再生ポリプロピレン１００部、添加剤である無水マレイン酸変性ポリプロピレン１部からなるコンパウンドを中心部に用いた。中心部に用いたコンパウンドは、表層部に用いたコンパウンドと同様の方法によって作成した。それぞれのコンパウンドを用い、共押出を行なった。以上の方法により、中心部の周囲を表層部が一体的に被覆するように押出成形された本発明に係るセルロース系粉体含有押出形材を作製した。
【００３０】
実施例９
実施例１において、中心部に用いるコンパウンドを既に押出された建築用押出形材の端材を粉砕したものに変更した以外は、実施例１と同様の操作を行なうことにより、中心部の周囲を表層部が一体的に被覆するように押出成形された本発明に係るセルロース系粉体含有建築用押出形材を作製した。
【００３１】
前記実施例６〜９で用いた主要材料及び成形加工時の粘度を表２にまとめて示す。
【表２】

【００３２】
【発明の効果】
以上のように、本発明によれば、セルロース系粉体を含む表層部の成形加工時の材料の粘度が無機系粉体及び／又はセルロース系粉体を含む中心部の成形加工時の材料の粘度よりも低いため、表層部の材料の成形加工性に優れ、容易に中心部の材料の周囲を被覆することができる。また、表層部として装飾性を備えた組成の材料を被覆することで、中心部に原料自体が既に種々の顔料や染料で着色されているものや粒径及び／又は種類の異なる粉体を混合して用いることができので、意匠性に優れる外観を有するセルロース系粉体含有押出形材を生産性よく低コストで製造することができ、資源の有効利用や地球環境保護に資することができると共に、サンディング等の簡単な表面処理により木目様の模様を容易に付与でき、消費者のニーズに充分に応えることができる。
【図面の簡単な説明】
【図１】セルロース系粉体含有押出形材の一例を示す断面図である。
【図２】セルロース系粉体含有押出形材の他の例を示す断面図である。
【図３】セルロース系粉体含有押出形材のさらに他の例を示す断面図である。
【図４】セルロース系粉体含有押出形材の別の例を示す断面図である。
【図５】セルロース系粉体含有押出形材のさらに別の例を示す断面図である。
【符号の説明】
１板状成形板
１ａ中空部を有する板状成形品
２中心部
３表層部
４中空部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cellulosic powder-containing extruded shape and a method for producing the same. More specifically, the periphery of the material of the central portion is integrally covered with the material of the surface layer portion, and the appearance is excellent in design. The present invention also relates to a cellulosic powder-containing extruded shape which can easily produce a grain-like pattern by a simple surface treatment such as sanding and a method for producing the same.
[0002]
[Prior art]
Various types of cellulosic powder-containing extruded shapes have been developed in the past, and the use of cellulosic powder as a filler is especially for the purpose of recycling resources such as wood chips, wood-based building waste, and waste paper. It is an effective method. In addition, it is economically advantageous to increase the proportion of cellulosic powder in the extruded form containing cellulosic powder and to reduce the proportion of polyolefin, and as wood powder increases, an excellent wood texture is obtained. It is done. A cellulose-based powder-containing composite resin molded article having such a composition is disclosed in Patent Document 1, for example.
[0003]
However, in the material used for the cellulose-based powder-containing extruded shape, there is no distinction between the surface layer portion and the center portion, and the material having the same composition as the surface layer portion having excellent design properties is also used in the center portion. There was a limit to the materials that could be produced. Moreover, even if a material having a design property is used for the surface layer portion and a material that does not require a design property is used for the center portion, the viscosity of the material at the time of forming the surface layer portion is the same as or higher than the viscosity of the material of the center portion. Then, it is difficult for the material of the surface layer portion to cover the periphery of the material of the central portion. If the pressing force at the time of extrusion molding is increased and the coating is forcibly covered, the shape of the center portion becomes distorted, so that there is a problem that a uniform shape cannot be obtained due to deformation.
[0004]
[Patent Document 1]
Japanese Patent Publication No. 59-30176 (Claims)
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems, and the object thereof is excellent in molding processability of the material of the surface layer portion, and can easily cover the periphery of the material of the center portion, and has a design property. And a cellulosic powder-containing extruded profile that can easily produce a grain-like pattern by a simple surface treatment such as sanding, and that can fully meet the needs of consumers, and Such a cellulosic powder-containing extruded profile can be produced with good productivity and at low cost, and by coating a material having a decorative composition as the surface layer, the raw material itself already contains various pigments and dyes at the center. Provided with a method that can contribute to the effective use of resources and the protection of the global environment, which can be used by mixing powders of waste materials, recycled resin powders, and powders of different particle sizes and / or types There is.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, at least a resin (A) and a cellulosic powder (B), the surface layer part having a thickness of 0.5 to 3 mm, and at least the resin (A) and a cellulose-based powder and / or inorganic powder (B ') and cellulosic powders containing extruded profile which has a central portion formed by integrally extrusion-molded by coextrusion containing, the surface layer portion and Both the center part further contains a polyolefin resin modified with an unsaturated carboxylic acid or derivative thereof, the composition of the center part is different from the surface layer part, and the viscosity of the material at the time of molding of the surface layer part is The viscosity of the material of the center part is lower than the viscosity of the material at the time of molding processing of the center part, the viscosity of the material of the center part is 100 to 10000 Pa · s, and the viscosity of the material of the surface layer part is 50 to 9900 Pa · s. Cellulosic powder A body-containing extruded profile is provided.
In a preferred embodiment, the surface layer portion contains the resin (A) and the cellulose-based powder (B) at a ratio (mass ratio) of A: B = 90 to 10:10 to 90. The central portion contains the resin (A) and the cellulose powder and / or the inorganic powder (B ′) at a ratio (mass ratio) of A: B ′ = 90 to 10:10 to 90. Further, in another preferred embodiment, the surface layer portion is further contain an inorganic powder, and a different type than the cellulosic powder which cellulosic powder contained in the central portion is included in a surface portion And / or the particle size , or the inorganic powder contained in the center portion is of a different type and / or particle size from the inorganic powder contained in the surface layer portion .
[0007]
Furthermore, according to the present invention, there is also provided a method for producing the extruded product containing cellulosic powder, and the basic aspect thereof is such that the volatile component when measured at 130 ° C. is 0.5% by mass or less. the adjusted cellulose powder, resin, preferably mixed together and / or kneading the recycled resin, and modified polyolefin resin with an unsaturated carboxylic acid or its derivative, or further a inorganic powder such as reproduction polyolefin, the surface layer The material of the central part and the material of the central part both contain the polyolefin resin modified with the unsaturated carboxylic acid or derivative thereof, and the viscosity of the central part having a viscosity of 100 to 10,000 Pa · s and the viscosity of 50 Two types of materials having different viscosities at the time of molding and made of a surface layer material of ˜9900 Pa · s are prepared, and the viscosity of the material at the time of molding is relatively low A high viscosity center of the material during molding a layer portion integrally extruded by co-extrusion, modified with at least the resin (A) and the cellulose-based powder (B) unsaturated carboxylic acid or derivative thereof A surface layer portion having a thickness of 0.5 to 3 mm, at least a resin (A), a cellulose powder and / or an inorganic powder (B ′), and an unsaturated carboxylic acid or a derivative thereof. And a center part containing the polyolefin resin modified with the above-mentioned is produced by integrally extrusion molding, and the composition of the center part is different from that of the surface layer part. .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
As a result of diligent research to achieve the above-described problems, the inventors of the present invention have found that the viscosity of the material at the time of molding of the surface layer portion containing the cellulose-based powder is the cellulose-based powder in the production of the extruded product containing the cellulose-based powder. When the viscosity of the material including the body and / or inorganic powder is lower than that of the material at the time of molding, the surface layer material is excellent in moldability and can easily cover the center material. It has an appearance that is excellent in design and can easily produce a grain-like pattern by simple surface treatment such as sanding, and an extruded shape containing cellulosic powder that can fully meet the needs of consumers is obtained. In addition, by covering a material with a decorative composition as a surface layer portion, the raw material itself is already colored with various pigments and dyes in the center portion, powder of recycled resin, particle size And / or different kind Found that cellulosic powder-containing extruded profiles can be produced with good productivity and at low cost, and can contribute to effective use of resources and protection of the global environment. It has come to be. The term “waste material” used here refers to the waste of cellulosic powder-containing extruded shapes and wood products, and “recycled resin” refers to a so-called recycled resin that has already been used once or more. Or the like that are collected in the molding process.
[0009]
In the present specification, the “viscosity during molding” refers to the viscosity of the material at the molding temperature (extrusion temperature), and is measured by, for example, “JIS K 7199 Thermoplastic Flow Characteristics Test Method Using Capillary Rheometer”. In addition, as a device used at that time, a Capillograph manufactured by Toyo Seiki Co., Ltd. is used. As an example of the measurement conditions, a measurement temperature (extrusion temperature) of 180 ° C. and a shear rate of 608 sec ⁻¹ can be adopted. Any condition may be used as long as the relative viscosity can be objectively evaluated. In the present invention, the specific viscosity of the center part and the surface layer part is such that the material of the center part has a viscosity of 100 to 10,000 Pa · s and the material of the surface part has a viscosity of 50 to 9900 Pa · s.
[0010]
As a method for making the viscosity of the material at the time of molding of the surface layer portion containing the cellulose-based powder lower than the viscosity of the material at the time of molding processing of the central portion containing the cellulose-based powder and / or inorganic powder Any method may be used, for example, a method using a resin having a low viscosity as a base resin, a method of adding a lubricant, a method of reducing the filling amount of cellulose powder such as wood flour, wood powder to be filled, etc. The method using a thing with a small particle size etc. is mentioned, These means can be employ | adopted individually or in combination. Furthermore, when cellulose-based powder having a large particle size is used in the central portion and cellulose-based powder having a small particle size is used in the surface layer portion, in addition to a decrease in the viscosity of the surface layer portion, cellulose having a large particle size in the surface layer portion is used. Cellulose powder dropout due to expansion and contraction due to water absorption and drying of wood powder exposed to the surface due to rainwater when used outdoors etc. In addition, it is possible to prevent the change of the surface texture, the adhesion of dirt, etc., or to make it less noticeable.
[0011]
In the cellulosic powder-containing extruded profile of the present invention, the cellulosic powder is exposed on the surface by a simple surface treatment such as sanding, so that a grain-like pattern can be easily created. The thickness is preferably 0.5 to 3 mm. If the surface layer is thinner than 0.5 mm, when the surface resin layer is removed by sanding or the like, the center part may be exposed and the decorativeness may be impaired. On the other hand, if the surface layer is thicker than 3 mm, it is economically disadvantageous. .
[0012]
Hereinafter, each component of the cellulose-based powder-containing extruded profile of the present invention will be described. The central portion is modified with at least a resin, a cellulose-based powder, and / or an inorganic powder, and an unsaturated carboxylic acid or a derivative thereof. The material including the polyolefin resin and the surface layer portion are made of at least a resin, a cellulose-based powder, and a material including a polyolefin resin modified with an unsaturated carboxylic acid or a derivative thereof .
[0013]
The cellulosic powder may be anything, for example, wood powder, bamboo powder, pulp, bacus, kenaf, sawdust, wood fiber, rice husk, crushed chip material, fruit flour, waste paper, etc. Alternatively, two or more types can be used in combination. On the other hand, any inorganic powder may be used, and examples thereof include hydroxides, oxides, inorganic salts, silicate compounds, and the like, and these can be used alone or in combination of two or more.
Cellulose powder and / or inorganic powder can be used alone or in combination of two or more at the center of the cellulose powder-containing extruded profile of the present invention. A powder can be used individually or in combination of 2 or more types. As the cellulose-based powder used for the surface layer portion, it is particularly preferable to use wood powder.
[0014]
In addition, if the cellulose powder and / or the inorganic powder contains a volatile component such as moisture, this foams in the processing step, causing a product defect. Therefore, when the cellulose-based powder and / or inorganic powder contains volatile components, it should be dried in advance and adjusted so that the volatile components are 0.5% by mass or less when measured at 130 ° C. Is preferred.
[0015]
The resin may be any thermoplastic resin, but polyolefin is particularly preferable. The polyolefin may be any material such as low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, polystyrene, polyvinyl acetate, polyvinyl chloride, polyvinylidene chloride, polyacrylic acid, polyacrylate, Polyacrylic acid ester, polybutadiene, polyisoprene, polychloroprene, ethylene propylene rubber, acrylonitrile-butadiene-styrene copolymer, acrylonitrile-ethylene propylene rubber-styrene copolymer, ethylene vinyl acetate copolymer, and the like. It can use individually or in combination of 2 or more types. Among these polyolefins, polypropylene is particularly preferable because it is inexpensive and industrially mass-productive, is lightweight and excellent in rigidity, has relatively good heat resistance, and has good moldability.
[0016]
The surface layer part in the cellulose-based powder-containing extruded shape material is a ratio of A: B = 90 to 10:10 to 90, preferably 70 to 30:30 to 70, between the resin (A) and the cellulose powder (B). It is appropriate to include (mass ratio). If the cellulosic powder is less than 10:90 in the composition ratio with the resin in the surface layer portion, the blending amount of the cellulosic powder to be added is small, and the wood texture close to nature is extremely impaired. On the other hand, if the cellulosic powder is more than 90:10 in terms of the composition ratio with the resin, the resin does not go around each part of the cellulosic powder and / or the inorganic powder, so that the cellulose This is not preferable because a powder-containing extruded shape is obtained.
[0017]
On the other hand, the central part of the cellulose-based powder-containing extrusion-shaped material is a resin (A) and a cellulose-based powder and / or an inorganic powder (B ′) A: B ′ = 90-10: 10-90, It is suitable to contain in the ratio (mass ratio) of 70-30: 30. If the cellulose-based powder and / or the inorganic-based powder is less than 10:90 in terms of the composition ratio with the resin in the center, it is not preferable because the amount of the relatively expensive resin is large and economically disadvantageous. On the other hand, if the cellulosic powder and / or inorganic powder is more than 90:10 in the composition ratio with the resin, the resin does not go around each part of the cellulosic powder and / or inorganic powder, Since an extruded shape containing a cellulose-based powder having a problem in strength is obtained, it is not preferable.
[0018]
In the present invention, the in addition to the respective components, the addition of cellulose-based powder and the resin, in particular an unsaturated carboxylic acid or modified polyolefin resin derivative thereof for improving the affinity with the polyolefin, Moreover , various additives, such as a coloring agent , can be added as needed . The unsaturated carboxylic acid may be any one, such as maleic anhydride, itaconic anhydride, citraconic anhydride, maleic acid, itaconic acid, citraconic acid, crotonic acid, isocrotonic acid, mesaconic acid, angelic acid, Examples include sorbic acid, acrylic acid, methacrylic acid, and the like. These can be used alone or in combination of two or more. The unsaturated carboxylic acid derivative may be any derivative, and one or more of the unsaturated carboxylic acid metal salts, amides, imides, esters and the like may be used in combination. it can.
[0019]
Any colorant may be used, such as titanium dioxide, cobalt oxide, ultramarine, bitumen, dial, silver vermilion, white lead, red lead, yellow lead, strontium chromate, titanium yellow, titanium black, zinc chromate, Iron Black, Molybdenum Red, Molybdenum White, Resurge, Lithopone, Carbon Black, Emerald Green, Guinea Green, Cadmium Yellow, Cadmium Red, Cobalt Blue, Azo Pigment, Phthalocyanine Blue, Isoindolinone, Quinacridone, Dioxazine Violet, Perinone Perylene These can be used, and these can be used alone or in combination of two or more.
In addition, various additives such as an antioxidant, an ultraviolet absorber, a light stabilizer, an antistatic agent, a lubricant, and a flame retardant can be added as necessary.
[0020]
In the production of the extruded product containing cellulose-based powder of the present invention, as described above, the cellulose previously adjusted by a drying step or the like so that the volatile component when measured at 130 ° C. is 0.5% by mass or less. Mixing and / or kneading resin powder with resin, preferably regenerated resin such as regenerated polyolefin, polyolefin resin modified with unsaturated carboxylic acid or derivatives thereof, and if necessary inorganic powder and other additives Two types of materials having different viscosities during molding are prepared. Next, the surface layer portion having a relatively low viscosity of the material at the time of molding and the central portion having a high viscosity of the material at the time of molding can be integrally produced by extrusion molding by a co-extrusion method.
[0021]
Several examples of the extruded product containing cellulosic powder produced by the method as described above are shown in FIGS. 1 to 3 show a plate-shaped molded product, and the plate-shaped molded plate 1 shown in FIG. 1 has the entire surface of the side portion of the central portion 2 integrally covered with the surface layer portion 3, and in FIG. Only the top surface of 2 is integrally covered with the surface layer portion 3 in FIG. 4 and 5 show a plate-shaped molded product 1a having a hollow portion 4. In FIG. 4, only the upper surface of the central portion 2 is covered with the surface layer portion 3 in FIG. Yes. As a matter of course, the present invention is not limited to these embodiments, and it is possible to produce cellulosic powder-containing extruded shapes having various shapes and structures.
[0022]
In addition, the obtained extruded shape material can easily create a grain-like pattern by a simple surface treatment such as sanding, and further, by applying processing such as grinding, polishing, cutting, engraving, etc. , Frame materials, wall materials, floor materials, doors, panels, headboards, waistboards, slats, wet edges, picture frames, deck materials, roofs, slats, shutters, gutters, pillars, pillar covers, siding boards, indoor furniture And it can be finished into products such as frame materials, flower beds, fences, benches, gates, signboards, louvers, and handrails.
[0023]
【Example】
EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated more concretely, of course, this invention is not limited at all by the following Example. Unless otherwise specified, “part” described in the examples means “part by mass”. In the following Examples and Comparative Examples, as the extruder, any of a twin screw extruder, a single screw extruder, a multi-screw extruder, or a combination thereof may be used. Furthermore, the screw shape used in the extruder is not particularly limited.
[0024]
Example 1
122 parts of wood powder with a particle size of 70 wt% or more dried so that the volatile component when measured at 130 ° C. is 0.5 mass% or less passes through 100 mesh, 100 parts of recycled polypropylene, and anhydrous maleate as an additive 1 part of acid-modified polypropylene and 12 parts of pigment were added and kneaded with a Henschel mixer to obtain a compound used for the surface layer part. The obtained compound was pulverized with a crusher to adjust the particle size. In addition, similar to the material used for 122 parts of wood powder and non-uniform particle diameter that do not pass 30 wt% or more through 100 mesh dried so that the volatile component when measured at 130 ° C. is 0.5% by mass or less. A compound composed of 100 parts of recycled polypropylene and 1 part of maleic anhydride-modified polypropylene as an additive was used in the center. The compound used for the central part was prepared by the same method as the compound used for the surface layer part. Coextrusion was performed using each compound. The cellulose-based powder-containing extruded shape according to the present invention was produced by the above method.
[0025]
Examples 2-5
In Example 1, except that the particle size of the wood powder in the compound used in the center portion was changed, the same extrusion conditions and operations as in Example 1 were performed, whereby the cellulose-based powder-containing extruded shape according to the present invention was used. Was made.
[0026]
Table 1 summarizes the main materials used in Examples 1 to 5 and the viscosity during molding.
[Table 1]

In the said Examples 1-5, the viscosity of the material at the time of the shaping | molding process of the surface layer part containing a cellulose powder is more than the viscosity of the material at the time of the shaping | molding process of the center part containing an inorganic type powder and / or a cellulose powder. Since it is low, the material of the surface layer portion is excellent in molding processability, and the periphery of the material of the central portion can be easily covered.
[0027]
Example 6
122 parts of wood powder with a particle size of 70 wt% or more dried so that the volatile component when measured at 130 ° C. is 0.5 mass% or less passes through 100 mesh, 100 parts of recycled polypropylene, and anhydrous maleate as an additive 1 part of acid-modified polypropylene and 12 parts of pigment were added and kneaded with a Henschel mixer to obtain a compound used for the surface layer part. The obtained compound was pulverized with a crusher to adjust the particle size. In addition, the viscosity of the powder is 122 parts of wood powder having a particle size of 70 wt% or more dried so that the volatile component when measured at 130 ° C. is 0.5% by mass or less and passes through 100 mesh, and the resin used for the surface layer part. A compound comprising 100 parts of recycled polypropylene having a high weight and 1 part of maleic anhydride-modified polypropylene as an additive was used in the center. The compound used for the central part was prepared by the same method as the compound used for the surface layer part. Coextrusion was performed using each compound. By the above-described method, an extruded shape containing a cellulose-based powder according to the present invention was produced by extrusion molding so that the surface layer portion integrally covers the periphery of the center portion.
[0028]
Example 7
122 parts of wood powder with a particle size of 70 wt% or more dried so that the volatile component when measured at 130 ° C. is 0.5% by mass or less passes through 100 mesh, 100 parts of recycled polypropylene, and anhydrous maleate as an additive 1 part of acid-modified polypropylene and 12 parts of pigment were added and kneaded with a Henschel mixer to obtain a compound used for the surface layer part. The obtained compound was pulverized with a crusher to adjust the particle size. In addition, 122 parts of wood powder having irregular particle diameters that do not pass 30 wt% or more through 100 mesh dried so that the volatile component when measured at 130 ° C. is 0.5% by mass or less than the already colored surface layer part A compound comprising 100 parts of recycled polypropylene having a high viscosity and 1 part of maleic anhydride-modified polypropylene as an additive was used in the center. The compound used for the central part was prepared by the same method as the compound used for the surface layer part. Coextrusion was performed using each compound. By the above-described method, an extruded shape containing a cellulose-based powder according to the present invention was produced by extrusion molding so that the surface layer part integrally covers the periphery of the center part.
[0029]
Example 8
122 parts of wood powder with a particle size of 70 wt% or more dried so that the volatile component when measured at 130 ° C. is 0.5 mass% or less passes through 100 mesh, 100 parts of recycled polypropylene, and anhydrous maleate as an additive 1 part of acid-modified polypropylene, 12 parts of pigment, and 0.3 part of lubricant were added and kneaded with a Henschel mixer to obtain a compound used for the surface layer part. The obtained compound was pulverized with a crusher to adjust the particle size. In addition, 122 parts of wood powder having irregular particle diameters that do not pass 30 wt% or more through 100 mesh dried so that the volatile component when measured at 130 ° C. is 0.5% by mass or less than the already colored surface layer part A compound comprising 100 parts of recycled polypropylene having a high viscosity and 1 part of maleic anhydride-modified polypropylene as an additive was used in the center. The compound used for the central part was prepared by the same method as the compound used for the surface layer part. Coextrusion was performed using each compound. By the above-described method, an extruded shape containing a cellulose-based powder according to the present invention was produced by extrusion molding so that the surface layer portion integrally covers the periphery of the center portion.
[0030]
Example 9
In Example 1, except that the compound used for the central part was changed to a pulverized end material of the extruded extruded structural material, by performing the same operation as in Example 1, the periphery of the central part was A cellulosic powder-containing extruded material for construction according to the present invention, which was extruded so that the surface layer portion was integrally covered, was produced.
[0031]
Table 2 summarizes the main materials used in Examples 6 to 9 and the viscosity during molding.
[Table 2]

[0032]
【The invention's effect】
As described above, according to the present invention, the viscosity of the material at the time of the molding process of the surface layer portion including the cellulosic powder is such that the viscosity of the material at the time of the molding process of the center portion including the inorganic powder and / or the cellulosic powder is reduced. Since it is lower than the viscosity, it is excellent in molding processability of the material of the surface layer part, and the periphery of the material of the center part can be easily covered. In addition, by coating a material with a decorative composition as the surface layer, the raw material itself is already colored with various pigments and dyes and powders with different particle sizes and / or types are mixed in the center. As a result, it is possible to produce a cellulosic powder-containing extruded shape having an excellent appearance with good design at a low cost and contribute to the effective use of resources and the protection of the global environment. In addition, a simple surface treatment such as sanding can easily give a grain-like pattern and can fully meet the needs of consumers.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of an extruded profile containing cellulosic powder.
FIG. 2 is a cross-sectional view showing another example of an extruded profile containing cellulosic powder.
FIG. 3 is a cross-sectional view showing still another example of a cellulosic powder-containing extruded profile.
FIG. 4 is a cross-sectional view showing another example of a cellulosic powder-containing extruded profile.
FIG. 5 is a cross-sectional view showing still another example of an extruded profile containing cellulosic powder.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Plate-shaped molded board 1a Plate-shaped molded product which has a hollow part 2 Center part 3 Surface layer part 4 Hollow part

Claims

A surface layer portion containing at least a resin (A) and a cellulose-based powder (B) and having a thickness of 0.5 to 3 mm, and at least a resin (A), a cellulose-based powder and / or an inorganic powder (B ') And a center part including the cellulose-based powder-containing extruded shape integrally formed by coextrusion, wherein both the surface layer part and the center part are further made of an unsaturated carboxylic acid or a derivative thereof. It contains a modified polyolefin resin, the composition of the central part is different from the surface layer part, and the viscosity of the material during the molding process of the surface layer part is lower than the viscosity of the material during the molding process of the central part. And the viscosity of the material of the said center part is 100-10000 Pa.s, and the viscosity of the material of a surface layer part is 50-9900 Pa.s, The cellulosic powder containing extruded shape characterized by the above-mentioned.

The cellulosic system according to claim 1, wherein the surface layer part contains the resin (A) and the cellulosic powder (B) in a ratio (mass ratio) of A: B = 90 to 10:10 to 90. Powder-containing extruded profile.

The center portion includes the resin (A) and the cellulose powder and / or the inorganic powder (B ′) in a ratio (mass ratio) of A: B ′ = 90 to 10:10 to 90, The extruded shape containing cellulosic powder according to claim 1 or 2 .

Surface layer portion, the resin (A) and the cellulose-based powder (B) A: B = 70~30 : any of claims 1 to 3, characterized in that it comprises 30 to 70 ratio (mass ratio) 2. An extruded shape containing a cellulose-based powder according to item 1.

The cellulose-based powder according to any one of claims 1 to 4 , wherein the inorganic powder is at least one selected from the group consisting of hydroxides, oxides, inorganic salts, and silicate compounds. Powder-containing extruded profile.

Central portion, the resin (A) and the cellulose-based powder (B) A: B = 70~30 : any of claims 1 to 4, characterized in that it comprises 30 to 70 ratio (mass ratio) 2. An extruded shape containing a cellulose-based powder according to item 1.

Cellulosic powder wood flour, bamboo powder, pulp, bagasse, sawdust, wood fiber, rice hulls, and any one of claims 1 to 6, characterized in that at least one selected from the group consisting of paper 1 The extruded product containing a cellulose-based powder according to Item.

The cellulosic powder-containing extruded shape according to any one of claims 1 to 6 , wherein the cellulosic powder is wood flour.

The extruded material containing a cellulose-based powder according to any one of claims 1 to 8 , wherein the resin is a polyolefin.

The extruded material containing a cellulose-based powder according to any one of claims 1 to 8 , wherein the resin is polypropylene.

The extruded material containing a cellulose-based powder according to any one of claims 1 to 10 , wherein the resin is a recycled material.

The surface layer portion and / or the central portion further contains at least one additive selected from the group consisting of a colorant, an antioxidant, an ultraviolet absorber, a light stabilizer, an antistatic agent and a lubricant. The extruded shape containing a cellulose-based powder according to any one of claims 1 to 11 .

Cellulose powder adjusted to have a volatile component of 0.5% by mass or less when measured at 130 ° C., polyolefin resin modified with resin and unsaturated carboxylic acid or derivative thereof, or further inorganic powder And the material of the surface layer part and the material of the central part both contain the polyolefin resin modified with the unsaturated carboxylic acid or derivative thereof, and the viscosity is 100 to 10,000 Pa · s. Two types of materials having different viscosities at the time of molding processing, consisting of a material at the center and a surface layer material having a viscosity of 50 to 9900 Pa · s, are prepared, and a surface layer portion having a relatively low viscosity at the time of molding And a central portion having a high viscosity of the molding material are integrally extruded by coextrusion, and at least the resin (A), the cellulosic powder (B), and the unsaturated carboxylic acid Or a polyolefin resin modified with a derivative thereof and having a thickness of 0.5 to 3 mm, at least a resin (A), a cellulose powder and / or an inorganic powder (B ′). A cellulosic powder-containing extruded shape formed by integrally extruding a central portion containing a polyolefin resin modified with an unsaturated carboxylic acid or a derivative thereof and having a composition at the central portion different from that of the surface layer portion. A method for producing an extruded shape containing a cellulose-based powder, characterized by comprising:

The method according to claim 13 , wherein the resin is a regenerated polyolefin.

The method according to claim 13 or 14 , wherein the inorganic powder is at least one selected from the group consisting of hydroxides, oxides, inorganic salts, and silicate compounds.