成果報告書詳細
管理番号20120000000744
タイトル*平成23年度中間年報 グリーン・サステイナブルケミカルプロセス基盤技術開発/化学品原料の転換・多様化を可能とする革新グリーン技術の開発/セルロースナノファイバー強化による自動車用高機能化グリーン部材の研究開発
公開日2012/7/11
報告書年度2011 - 2011
委託先名国立大学法人京都大学 京都市 三菱化学株式会社 DIC株式会社 王子製紙株式会社
プロジェクト番号P09010
部署名電子・材料・ナノテクノロジー部
和文要約和文要約等以下本編抜粋:
1. 研究開発の内容及び成果等
本研究開発では、グリーン・サステイナブルケミカル(GSC)プロセスにより製造されるバイオポリプロピレン(バイオPP)、バイオポリアミドなどのプラスチックを、高強度・低熱膨張のセルロースナノファイバー(CNF)で補強し(図1)、100%非石油系資源由来の自動車用高機能樹脂部材を製造するための基盤技術開発を行っている。京都大学、京都市、王子製紙株式会社、DIC株式会社(星光PMC 株式会社を含む)、三菱化学株式会社が委託を受け共同実施している。
本研究開発の特徴は、京都大学を集中研とし、外部アドバイザーとして、トヨタ車体(株)、日産自動車(株)、スズキ(株)、(株)デンソー、(株)日本製鋼所が参画し、大学、公設試、化学会社、製紙会社の産官学・異分野垂直連携で確固たるサプライチェーンを構築しながら、商品力のある高機能化グリーン部材の開発を集中研方式で効率的に推進する点である。
英文要約The fundamental technology to improve the interphase between cellulose nanofibers (CNF) and matrix resins such as high density polyethylene (HDPE), polypropylene resin (PP) and epoxy resin has been developed in order to use cellulose nanofibers to reinforce automotive plastic parts. The project consists of three parts as follows: 1) development of the technology for the chemical modification of cellulose nanofibers suitable for thermoplastic resin; 2) development of the technology for the chemical modification of cellulose nanofibers suitable for thermosetting resin; 3) development of the compatibilizer for interphase control. In parallel, CNF-reinforced plastic compounds were supplied to automotive companies, who joined in this project as advisers and supplied their evaluations. The results were as follows.
1. The development of chemical modification of cellulose nanofibers (CNF)
The reinforcement using chemically modified 10wt% CNF was found to increase Young’s modulus and tensile strength of HDPE by 4.5 times and 2.4 times, respectively. Similar reinforcement effects on the mechanical properties were obtained in PP and PA12. Interestingly, the CTE of PA12 reduced to 33 ppm/k by the addition of 10wt% CNF. The PA11 (bio-polyamide) composites reinforced with chemically modified CNF showed improved heat distortion temperature. The chemical modification of CNF was also found to be effective in the reinforcement of epoxy resin.
2. The foaming of CNF reinforced polyolefin.
The micro-foaming of chemically treated CNF was tried using super critical CO2 method. In the foaming process of HDPE resin induced by the existence of cellulose nanofibers, the diameter of the bubbles decreased while keeping same specific Young’s modulus with unfoamed CNF reinforced HDPE. Young’s modulus of 2 GPa was attained at a specific gravity of 0.5 and a CNF content of 15wt%.
3. The dyeing of cellulose nanofibers and its application as fillers.
The cellulose nanofibers were dyed by conventional methods using in cotton and the color changes were evaluated. The mixing of colored CNF was also tried.
4. Establishment of a sample supply system
A system for supplying chemically modified CNF-reinforced plastic compounds to the automotive companies that participated in this project as advisers has been established.
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