赵西坡,李培东,熊金松,吴灿阳,林真,彭少贤.植物纤维基包装材料中纤维悬浮体流变行为研究[J].包装工程,2023,44(3):1-7.
ZHAO Xi-po,LI Pei-dong,XIONG Jin-song,WU Can-yang,LIN Zhen,PENG Shao-xian.Rheological Behavior of Fiber Suspension in Plant Fiber based Packaging Materials[J].Packaging Engineering,2023,44(3):1-7. |
| 植物纤维基包装材料中纤维悬浮体流变行为研究 |
| Rheological Behavior of Fiber Suspension in Plant Fiber based Packaging Materials |
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| DOI：10.19554/j.cnki.1001-3563.2023.03.001 |
| 中文关键词: 植物纤维 纤维悬浮液 流变行为 |
| 英文关键词: plant fiber fiber suspension rheological behavior |
| 基金项目:国家自然科学基金(51273060) |
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| 中文摘要: |
| 目的 采用可再生的植物纤维机械搅拌制备植物纤维悬浮体系，探究纤维悬浮液的流变性影响因素和体系中纤维的分散与取向，为后续工业化产品的加工和运输设计奠定基础。方法 利用旋转流变仪测试纤维质量分数、长径比(纤维长度)、温度和水溶性高分子等各个因素对体系流变性能的影响。结果 纤维悬浮体系为非牛顿流体，表现剪切变稀现象。溶液的黏度随温度的变化经线性拟合符合Arrhenius方程。纤维质量分数、长径比(纤维长度)的提高均会增加体系表观黏度，促进纤维的分散及网络结构形成，而温度的提高，黏度会呈指数形式减小。加入水溶性高分子PVA和聚丙烯酰胺分散剂均会提高体系黏度，有助于纤维的分散;PVA醇解度越高，亲水基团越多，易与纤维产生更多氢键作用，形成纤维网络结构，有助于后续发泡结构控制，醇解度过高则易凝胶化。阳离子型CPAM有助于改善纤维表面负电荷，破坏纤维静电吸附，使得纤维分散更均匀。结论 纤维质量分数、长径比(纤维长度)、体系温度等因素会影响纤维悬浮液流变特性，水溶性PVA和分散剂聚丙烯酰胺的加入有助于纤维的分散，对工业化纤维浆料配比加工具有参考意义，同时体系的黏流特性有利于生产线浆料输送系统的设备设计。 |
| 英文摘要: |
| The work aims to prepare plant fiber suspension system by mechanical stirring of renewable plant fiber, explore the factors affecting the rheology of the fiber suspension and the dispersion and orientation of the fiber in the system, so as to lay a foundation for the processing and transportation design of subsequent industrial products. The effects of fiber mass fraction, aspect ratio (fiber length), temperature and water-soluble polymer on the rheological properties of the system were tested by rotary rheometer. The fiber suspension system was a non-Newtonian fluid, showing shear thinning. The change of viscosity of solution with temperature was in line with Arrhenius equation through linear fitting. The increase of fiber mass fraction and aspect ratio (fiber length) would increase the apparent viscosity of the system, promote the dispersion of fibers and the formation of network structure, while the viscosity would decrease exponentially with the increase of temperature. The addition of water-soluble polymer PVA and polyacrylamide dispersant would improve the viscosity of the system and help to disperse the fiber; The higher the alcoholysis degree of PVA, the more hydrophilic groups, and it was easy to generate more hydrogen bonds with the fiber, forming a fiber network structure, which was helpful for the subsequent foam structure control. The higher the alcoholysis degree, the easier gel. Cationic CPAM could improve the negative charge on the fiber surface, destroy the electrostatic adsorption of the fiber, and make the fiber disperse more evenly. Factors such as fiber mass fraction, aspect ratio (fiber length), and system temperature will affect the rheological properties of fiber suspension. The addition of water-soluble PVA and dispersant polyacrylamide can help to disperse the fiber, which is of reference significance for the industrial fiber slurry proportioning process. At the same time, the viscous flow characteristics of the system are convenient for the equipment design of the slurry conveying system of the production line. |
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