J. Technology and Education , Vol.27, No.1, pp.7-10 (2020)

研究論文

 

マイクロ波加熱法による稲藁の液状化とポリウレタンフィルムの評価

 

寺澤 亮太¹，下古谷博司^*2

¹鈴鹿工業高等専門学校・応用物質工学専攻（〒510-0294　三重県鈴鹿市白子町官有地）

²鈴鹿工業高等専門学校・材料工学科（〒510-0294　三重県鈴鹿市白子町官有地）

*hshimo@mse.suzuka-ct.ac.jp

 

 Liquefaction of Rice Straw by Microwave Heating and Evaluation of Polyurethane Film Prepared from the Liquefied Rice Straw

 

Ryota TERAZAWA¹ and Hiroshi SHIMOFURUYA²

¹Advanced Applied Chemistry and Material Engineering Course, National Institute of Technology, Suzuka College,

Shiroko-cho, Suzuka-shi, Mie 5100294, Japan

²Department of Materials Science and Engineering, National Institute of Technology, Suzuka College,

Shiroko-cho, Suzuka-shi, Mie 5100294, Japan

 

(Received January 18, 2020; Accepted February 19, 2020)

 

Abstract

Recently, microwave heating has become an increasingly popular method of heating.  Rice straw was liquefied by microwave heating in the presence of polyethylene glycol 400(PEG400) and sulfuric acid.  The effects of the reaction time, the sulfuric acid concentration and the ratio of rice straw to PEG400 were examined to obtain the optimum conditions for liquefying rice straw.  Results shows that optimum liquefaction conditions were 30min reaction time, 3% sulfuric acid concentration, and a 1:5 ratio of rice straw to PEG400.  The liquefied rice straw showed 291mPa･s of viscosity, 0.60% moisture content, an acid number of 2.76mg KOH/g, and a hydroxyl number of 252mg KOH/g.  Polyurethane film (PUF) was prepared by a solution-casting technique after copolymerization of the liquefied rice straw and polymeric methylene diphenylene diisocyanate in dichloromethane.  In addition, the structure of the PUF was analyzed with FT-IR, and the tensile property was evaluated.  Absorption bands due to the urethane bond were observed in FT-IR analysis, and the maximum tensile strength and the Young’s modulus were 31.7MPa and 0.57GPa, respectively.

Keyword：rice straw，microwave heating，liquefaction