木塑复合材料热解特性.pdf

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化工进展
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CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2015年第34卷增刊1
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研究开发
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木塑复合材料热解特性
孙剑平2,张志军2,王清文2,隋淑娟2,林晓娜2
沈阳建筑大学市政与环境工程学院,辽宁沈阳110168;2东北林业大学生物质材料科学
与技术教育部重点实验室,黑龙江哈尔滨150040
摘要:通过热重分析(TGA)和裂解/气质联用(PyGC/MS)对杨木/高密度聚乙烯(HDPE)木塑复合材料
WPC)进行热解,考察了木粉和聚媂烃塑籵热解过程中的相互作用。结果表明:生物质和塑料热解过程中存在
明显的协同作用,杨木在較低的温度下即开始发生热解,其提供的自由基参与了聚烯烃热解反应,产生了更多
的轻质烃类产物。而聚烯烃分解产生的碳氢化合物向生物质分解产生的自由基提供,促进挥发性物质生成,
部分押制了活性自由基进一步聚合结焦,得到了更多的挥发性产物和减少了固体残炭。
关键词:木塑复合材料;生物质;塑料;热重分析;热解
Pyrolysis characteristics of wood-plastic composites
SUN Jianping:, ZHANG Zhijun, WANG Qingwen, SUI Shujuan, LIN Xiaona
( School of Municipal and Environmental Engineering, Shenyang Jianzhu University, Shenyang 110168, Liaoning, China
2 Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University
Harbin 150040, Heilongjiang
Abstract: Thermo-gravimetric analysis (TGA) and pyrolysis gas chromatography/mass spectrometry
(PY-GC/MS) were employed to investigate the pyrolytic behavior and primary pyrolysis product
distribution of the pyrolysis of wood-plastic composites(w) The mutual effects of poplar wood and
high-density polyethylene were detailed discussed during pyrolysis. The results showed that a significant
synergistic effect between plastic and biomass was present in the pyrolysis process of WPC. The PY-GC/
MS indicated that due to the lower temperature of biomass component decomposition compared with
polyolefins, free radicals are formed from biomass pyrolysis and participate in reactions of
plastic
decomposition, initiating the scission of the synthetic polymer chain and yielding more light
paraffins. The TGA indicated that the experimental char yield of WPC was lower than theoretical ones at
final pyrolysis temperature. The reason could be that polyolenic polymers provide hydrogen during
nermal process with wood biomass and recondensation or recombination of thermal cracking products of
biomass is reduced, resulting in the less amount of car production and enhancement of volatile products
formation
Key words: Wood-plastic composites; biomass; plastic; thermo-gravimetric analysis; pyrolysis
随着世界化石能源储备的日趋耗竭和开采难度由于其化学惰性,在自然环境中难以生物降解,目
的增大,以及使用化石能源带来的环境污染问题,前的处理方法仍然以焚烧和填埋为主,带来了严重
尽快开发可替代能源,特别是可再生能源已经成为的环境污染和资源浪费问题。因为塑料组成主要是
亟需解决的重要课题。通过热化学转化技术可将来
源广泛、可再生的生物质转化为能源,快速热解是基金项目:国家科技支撑计划(2012BADB2BD4)及辽宁省教育厅
其中一项重要的转化技术口
科研项目(L2012209)。
第一作者:孙剑平(1977--),男,博士,讲师。联系人:王清
废弃塑料作为一种重要的固体废弃物〈MSWの,
文,教授。E-mailqwwang@nefu.edu.cn。