摘要
以茶籽油生产过程中的废弃物——油茶果壳为研究对象,首先采用亚硫酸盐预蒸煮实现纤维素、半纤维素和木素、茶皂素等组分的分离,然后经硫酸热水解得到油茶果壳纳米纤维素（CNC）,最后压滤制得高强度透明薄膜。利用SEM、TEM、XRD、TG、UV-vis、电子万能试验机对纳米纤维素及其薄膜进行了结构表征与热学性能、光学性能、力学性能测试。结果表明,从油茶果壳中提取分离得到的纳米纤维素呈棒状,直径为6~10nm,长度为300~500 nm,属于纤维素Ⅰ型,结晶度为68%,热分解温度为230℃;压滤制备得到的纳米纤维素薄膜厚度为0.03 mm时,在600~800 nm波段处透光率为76%~81%,拉伸强度为75.6 MPa,可用于制备高强度的透明食品薄膜包装材料。
Cellulose, hemicellulose and lignin, tea saponin and other components were first separated from the waste in the production process of tea seed oil-shell of Camellia oleifera Abel（SCOA） by using sulfite predigesting. Then, the obtained cellulose was thermally hydrolyzed by sulfuric acid to produce cellulose nanocrystals（CNC）. Finally, transparent films with high tensile strength were obtained by filter pressing. SEM, TEM, XRD, TG, UV-vis and universal strength testing machine were used to characterize the internal structure and thermal properties of CNC, the optical properties and mechanical properties of the films. The results showed that the derived CNC possessed a rod-like structure with a diameter in the range from 6 to 10 nm and a length from 300 to 500 nm. In addition, the CNC belonged to Ⅰ type cellulose, its crystallinity and decomposition temperature were about 68% and 230℃, respectively. The CNC film with 0.03 mm thickness exhibited transmittance between 76% and 81% at 600~800 nm wave-band with a tensile strength of 75.6 MPa. So, the CNC has a great potential for practical application in the field of food packaging.
作者
姚进
李知函
史军华
曾广胜
朱和平
YAO Jin;LI Zhi-han;SHI Jun-hua;ZENG Guang-sheng;ZHU He-ping(School of Packing Design and Art,Hunan University of Technology,Zhuzhou 412007,Hunan,China;School of Packaging and Materials Engineering,Hunan University of Technology,Zhuzhou 412007,Hunan,China;Guangxi Key Laboratory of Clean Pulp ＆ Papermaking and Pollution Control,Nanning 530004,Guangxi,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2018年第11期1853-1858,共6页
Fine Chemicals
基金
湖南省科技厅重点研发计划项目(2017WK2042)
湖南省自然科学基金项目(2017JJ4006)
湖南省研究生创新基金项目(CX2016B633)
广西清洁化制浆造纸与污染控制重点实验室开放项目(KF201712)
湖南工业大学“绿色包装与安全”重点项目(2016ZBLZ02)
“绿色包装与安全”博士生专项项目(2016ZBLB02)~~
关键词
油茶果壳
纳米纤维素
透明薄膜
生态包装材料
功能材料
shell of Camellia oleifera Abel
nanocellulose
transparent film
ecological packaging material
functional materials
