| 引用本文: | 付誉,叶菊娣,李小保,洪建国.NaOH/尿素溶液屏蔽木粉羟基制备注塑级生物基塑料[J].材料科学与工艺,2018,26(6):9-15.DOI:10.11951/j.issn.1005-0299.20170133. |
| FU Yu,YE Judi,LI Xiaobao,HONG Jianguo.Preparation of bio-based plastics by shielding hydroxyl of wood flour in NaOH/urea solvent system[J].Materials Science and Technology,2018,26(6):9-15.DOI:10.11951/j.issn.1005-0299.20170133. |
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| 摘要: |
| 为了解决石化资源日益紧缺和开发石化资源带来的环境污染，以可再生的农林废弃物胡桑枝条为原料制备了可注塑的生物基塑料.将球磨预处理的胡桑枝条粉放置在预冷的NaOH/尿素溶液中以-10 ℃溶解润胀1 h后，在捏合机中常温捏合，冷冻干燥得到捏合改性产物.捏合改性产物与一定量的甘油共混挤出制备生物基塑料.研究了不同溶液配比、甘油用量和甘油共混方式对改性产物力学性能的影响.结果表明:球磨木粉经过复合溶剂NaOH/尿素溶液体系捏合改性后，具有热塑性，加入甘油捏合或加入甘油共混挤出，能得到具有较好力学性能的生物基塑料，所制备的生物基塑料弯曲强度最大达到26.10 MPa，拉伸强度和断裂伸长率分别达到13.21 MPa和10.91%.以胡桑枝条木粉为原料，在NaOH/尿素体系中进行捏合改性后，木粉中羟基被屏蔽，结晶度降低，加入甘油增塑可制备出注塑级生物基塑料，实现了木粉的全组分高效利用.
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| 关键词: 球磨木粉 NaOH/尿素溶液 屏蔽改性 甘油 生物基塑料 力学性能 |
| DOI：10.11951/j.issn.1005-0299.20170133 |
| 分类号:TQ351.9 |
| 文献标识码:A |
| 基金项目:国家林业公益性行业科研专项(201204803)；江苏高校优势学科建设工程资助项目(PAPD). |
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| Preparation of bio-based plastics by shielding hydroxyl of wood flour in NaOH/urea solvent system |
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FU Yu, YE Judi, LI Xiaobao, HONG Jianguo
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(College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China)
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| Abstract: |
| In order to deal with the shortage and environmental pollution of petroleum resources, injection-moulded bio-based plastics were prepared with renewable mulberry branches from farming and forestry disposables. The mulberry branch flour was ball-milled with planetary ball mill and was dissolved in the pre-cooled NaOH/urea solution for 1h at -10 ℃. The mixture was kneaded and then dried in a freeze dryer. Finally, the kneaded products were extruded with a certain amount of glycerol to produce the bio-based plastics.Effects of different solution ratios, glycerol content, and different blending methods with glycerol on the properties of modified products were studied. Results showed that the ball-milled wood flour was thermoplastic after kneading and the end product exhibited better mechanical properties. Under the optimum technological conditions, the flexural strength of the bio-based plastics achieved 26.10 MPa, the tensile strength and the elongation at break reached 13.21 MPa and 10.91%, respectively.After the ball-milled wood flour was kneaded in the aqueous NaOH/urea solution, the hydrogen bonds of the wood flour were shielded and the degree of crystallinity was decreased. The injection-moulded bio-based plastic was prepared successfully by adding plasticizer glycerol into kneaded wood flour, achieving high efficient usage of the whole component of wood flour.
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| Key words: ball-milled wood flour NaOH/urea solution shielding modification glycerol bio-based plastics mechanical property |
