氯化胆碱/尿素预处理水稻秸秆及其解离纤维结构性能的表征

doi:10.3969/j.issn.0253-2417.2023.04.002

林产化学与工业 ›› 2023, Vol. 43 ›› Issue (4): 9-16.doi: 10.3969/j.issn.0253-2417.2023.04.002

氯化胆碱/尿素预处理水稻秸秆及其解离纤维结构性能的表征

范肖东¹^,², 韩善明³, 曲萍², 黄红英², 孙恩惠²^,*(), 翟胜丞¹^,*()

1. 南京林业大学材料科学与工程学院，江苏南京 210037
2. 江苏省农业科学院农业资源与环境研究所；农业农村部盐碱土改良与利用(滨海盐碱地)重点实验室；江苏省有机固体废弃物资源化协同创新中心，江苏南京 210014
3. 中国林业科学研究院林产化学工业研究所，江苏南京 210042

收稿日期:2022-04-21 出版日期:2023-08-28 发布日期:2023-08-26
通讯作者: 孙恩惠,翟胜丞 E-mail:enhsun@126.com;zhais@njfu.edu.cn
作者简介:翟胜丞，副教授，硕士生导师，研究领域为木材科学、生物质性能与利用；E-mail：zhais@njfu.edu.cn
孙恩惠，副研究员，硕士生导师，研究领域为秸秆纤维解离预处理与农用材料开发及其应用；E-mail：enhsun@126.com
范肖东(1997—)，男，江苏淮安人，硕士生，主要从事秸秆纤维地膜成膜及增韧改性技术的研究
基金资助:
江苏省农业科技自主创新资金资助项目(CX(21)3072);江苏省农业科学院探索性颠覆性创新计划项目(ZX(21)1221);江苏省重点研发计划资助项目(BE2020335)

Characterization of Choline Chloride/Urea Pretreated Rice Straw and Its Dissociative Fiber Structure and Properties

Xiaodong FAN¹^,², Shanming HAN³, Ping QU², Hongying HUANG², Enhui SUN²^,*(), Shengcheng ZHAI¹^,*()

1. College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
2. Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences; Key Laboratory of Saline-Alkali Soil Improvement and Utilization(Coastal Saline-Alkali Lands), Ministry of Agriculture and Rural Affairs; Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210014, China
3. Institute of Chemical Industry of Forestry Products, CAF, Nanjing 210042, China

Received:2022-04-21 Online:2023-08-28 Published:2023-08-26
Contact: Enhui SUN,Shengcheng ZHAI E-mail:enhsun@126.com;zhais@njfu.edu.cn

摘要/Abstract

摘要：

采用氯化胆碱/尿素低共熔溶剂(DES)体系预处理水稻秸秆，协同盘磨机械均质化处理对秸秆纤维进行解离，当DES添加量为秸秆质量的1.5%、2.5%、3.5%、4.5%时，制备的解离纤维浆料分别标记为DES-1.5%、DES-2.5%、DES-3.5%和DES-4.5%，并以未添加DES处理得到的样品为对照样(CK)。利用傅里叶红外光谱(FT-IR)、X射线衍射(XRD)仪、扫描电子显微镜和荧光显微镜对解离纤维的性能进行表征，通过NREL法分析不同DES添加量处理的解离纤维的化学组分，并计算盘磨机械能耗及解离纤维的成膜力学性能。结果表明：DES体系协同盘磨机械均质化预处理可通过氢键的竞争作用破坏LCC的连接，从而促进秸秆纤维的解离，利于纤维分丝帚化。与CK相比，当DES添加量为3.5%时，微纤丝角和结晶度分别由35.84°、41.3%提高至47.61°、50.1%，木质素质量分数下降了5.3个百分点，且秸秆纤维表面层断裂加剧，盘磨加工能耗降低了160 kW·h/t，该条件下制备的秸秆纤维地膜加权力学性能最好。荧光显微镜观察结果表明DES预处理可加速木质素向秸秆纤维表层的迁移和溶出。

关键词: 秸秆, 低共熔溶剂, 微纤丝角, 纤维解离, 纤维地膜, 力学性能

Abstract:

The rice straw was pretreated by choline chloride/urea deep eutectic solvent(DES) system, and the pretreated straw fiber was dissociated by mechanical homogenization treatment. With the DES addition of 1.5%, 2.5%, 3.5% and 4.5% of the straw mass, the prepared dissociated fiber slurries were labeled as DES-1.5%, DES-2.5%, DES-3.5% and DES-4.5%, respectively, while the sample without DES treatment was used as the control(CK). The properties of the dissociated fibers were characterized by Fourier transform infrared spectroscopy(FT-IR), X-ray diffraction(XRD), scanning electron microscopy(SEM) and fluorescence microscopy. The chemical composition of the dissociated fibers treated by different methods was analyzed by NREL method, and the mechanical energy consumption of the disc mill and the film-forming mechanical properties of the dissociated fibers were studied. The results showed that the homogenization pretreatment of DES system combined with disc grinding machine could destroy the connection of LCC through the competition of hydrogen bonds, thus promoting the dissociation of straw fibers and facilitating the fibrillation of fibers. Compared with CK, when the addition amount of DES was 3.5%, the microfibril angle and crystallinity increased from 35.84° and 41.3% to 47.61° and 50.1%, respectively, in addition to a lignin content decrease by 5.3 percentage points. Moreover, the fracture of the surface layer of rice straw fiber increased, and the energy consumption of disc milling decreased by 160 kW·h/t. The straw fiber mulch prepared under this condition had the best weighted mechanical properties. The results of fluorescence microscopy showed that DES pretreatment could accelerate the migration and dissolution of lignin to the surface of straw fiber.

Key words: straw, deep eutectic solvent, microfibri angel, fiber dissociation, fiber mulch, mechanical properties

中图分类号:

TQ35

范肖东, 韩善明, 曲萍, 黄红英, 孙恩惠, 翟胜丞. 氯化胆碱/尿素预处理水稻秸秆及其解离纤维结构性能的表征[J]. 林产化学与工业, 2023, 43(4): 9-16.

Xiaodong FAN, Shanming HAN, Ping QU, Hongying HUANG, Enhui SUN, Shengcheng ZHAI. Characterization of Choline Chloride/Urea Pretreated Rice Straw and Its Dissociative Fiber Structure and Properties[J]. Chemistry and Industry of Forest Products, 2023, 43(4): 9-16.

图/表 7

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DES添加量/% DES addition	能耗/(kW·h·t^-1) energy consumption	抗张指数/ (N·m·g^-1) tensile index	耐破指数/ (kPa·m²·g^-1) burst index	撕裂指数/ (mN·m²·g^-1) tear index	地膜综合性能 comprehensive performance of film
0	1 504.33	8.50	0.84	1.86	5.84
1.5	1 364.67	8.21	0.58	1.94	5.45
2.5	1 250.67	10.46	0.65	1.85	6.84
3.5	1 344.33	11.90	0.62	2.38	7.74
4.5	1 438.00	11.12	0.83	2.45	7.40

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氯化胆碱/尿素预处理水稻秸秆及其解离纤维结构性能的表征

Characterization of Choline Chloride/Urea Pretreated Rice Straw and Its Dissociative Fiber Structure and Properties

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