成果報告書詳細
管理番号20150000000436
タイトル*平成26年度中間年報 SIP(戦略的イノベーション創造プログラム) 革新的設計生産技術 リアクティブ3Dプリンタによるテーラーメイドラバー製品の設計生産と社会経済的な価値共創に関する研究開発(6)
公開日2015/7/18
報告書年度2014 - 2014
委託先名住友ゴム工業株式会社
プロジェクト番号P14030
部署名ロボット・機械システム部
和文要約
英文要約Title:Research on Innovative Design/Manufacturing Methodology of Tailor-made Rubber Products and Socio-Economic Value Co-Creation with Reactive 3D printer (FY2014-FY2015)FY2014 Annual Report

1.Contents and Results of Research Development
Business Contents, Performed Activities
In order to enable the production of tailor-made rubber products with a reactive 3D printer, research and investigation are performed for rubber materials and formulations for shoes.
A rubber sole is demanded to have hardness and wear resistance, and a rubber insole is demanded to have flexibility and lightweight property.
On the other hand, the common rubber materials are in the form of polymer and have very high viscosity due to the reinforcement with carbon or silica, and therefore they are not suitable for modeling through an ultrafine cylinder head of a reactive 3D printer and are thus demanded to have decreased viscosity.
Under the circumstances, the following three methods are simultaneously investigated for developing the optimum material for an ejection mechanism of a reactive 3D printer with a new specification:
(1) a method, in which a photofunctional monomer is added to a polymer rubber material to decrease the viscosity in the non-cured state, and the material is photocured after modeling;
(2) a method, in which photofunctional groups are grafted to liquid rubber or a rubber oligomer having decreased viscosity used as the starting material, and modeling and photocuring (polymerization) of the material are simultaneously performed;
and (3) other methods (e.g., a secondary crosslinking method).
2014 Fiscal Year
The patent application status of "the photocuring reaction", which is the important feature of the novel crosslinking mechanism of rubber materials, is investigated, and groups of materials that can be turned over to rubber crosslinking are explored based on the factual research on the materials other than rubber.
The feature development course is narrowed down while collecting the information from about thousand or more patent publications, and the possibility of the rubber crosslinking is summarized.
Based on that, photocured products of rubber are produced, and are evaluated for their rubber properties jointly with Kobe University, and in order to produce efficient crosslinked products, investigations on the reaction mechanism, the analytical approach on reaction rate, and the analysis methods are started.
Summary of Results
As there is no patent application relating to 3D printing of rubber materials, groups of materials that can be turned over to rubber crosslinking are explored, the candidate materials are narrowed down.
The materials are selected and compounded taking their fluidity into consideration, and the equipments that are suitable for ejecting rubber for material tests are selected.
A rubber sheet was able to be obtained through extrusion and UV curing of a crosslinked rubber powder mixture by combining the materials and equipments that are optimum under the current circumstances.
However, there are the vast number of issues to be solved, for example, the necessity of improvement of the dimensional accuracy, the measure for decreasing the specific gravity, the enhancement of the modulus as the rubber properties, the significant enhancement of the reaction rate for enabling agile production, et cetera.
In the future, the speed of exploring the materials will be increased by enhancing the material evaluation cycles due to the implementation of the selected equipments, and the world's first UV-crosslinked rubber 3D-printed high-rigidity rubber plate will be completed ahead of schedule within Heisei 27 fiscal year with an ejecting device simulating a 3D printer and the materials and formulations having high fluidity.
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