| 摘要: |
| 目的 以我国资源丰富的竹子和聚丙烯(PP)作为原料，研究竹材的预处理和成形工艺对其物理力学性能的影响，扩大竹材的应用领域。方法 通过碱液预处理，对竹条进行软化分丝。然后，利用热压技术将所提取的竹子与聚丙烯进行复合，并调节热压工艺，得出最优参数。结果 使用质量分数为6%的NaOH，在100 ℃下预处理2.5 h，通过辊压疏解，制备长竹纤维束(LBF)，LBF的抗拉强度为397.2 MPa。经过处理后，LBF/PP复合材料的储能模量达到9.49 GPa，比未处理的LBF/PP复合材料提升了11.5%。确定了最优热压条件:温度为190 ℃、时间为20 min、压力为6 MPa。随着长竹纤维含量的增加，LBF/PP复合材料的耐水性降低。结论 使用长竹纤维束所制备的LBF/PP复合材料具有优异的物理力学性能，有望作为结构材料应用于集装箱、托盘等，在包装应用领域有较好的前景。 |
| 关键词: 聚丙烯 竹塑复合材料 长竹纤维束 热压工艺 力学性能 |
| DOI：10.19554/j.cnki.1001-3563.2022.13.003 |
| 分类号:TB332 |
| 基金项目:国家自然科学基金项目(031020151) |
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| Long Bamboo Fiber Bundle Directional Reinforced Polypropylene Composite |
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HAN Yu-tong, WANG Kuang, BU Xiang-ting, LI Da-gang
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(College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China)
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| Abstract: |
| The work aims to prepare high performance long bamboo fiber bundle/polypropylene composite with rich bamboo and polypropylene (PP) in China, explore the effects of bamboo pretreatment and molding process on the physical and mechanical properties of the composite and broaden the application of bamboo material. The bamboo strips were softened and devillicated through pretreatment with alkali liquor. Then, the extracted bamboo was composed with polypropylene through hot pressing. The optimal parameters were obtained by adjusting the hot pressing process. After pretreatment with 6% sodium hydroxide at 100 ℃ for 2.5 h and decompression by roller, LBF was prepared. The tensile strength of LBF reached 397.2 MPa. After pretreatment, the energy storage modulus of LBF/PP composite was 9.49 GPa, which was 11.5% higher than that of the untreated LBF/PP composite. The optimum hot pressing process was determined as follows:temperature 190 ℃, time 20 min, pressure 6 MPa. With the increase of bamboo fiber content, the water resistance of LBF/PP composite was decreased. LBF/PP composites prepared with long bamboo fiber bundles have excellent physical and mechanical properties, and are expected to be used as structural materials for containers and pallets, and have a good prospect in packaging application. |
| Key words: polypropylene bamboo plastic composites long bamboo fiber bundle hot pressing process mechanical property |
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