木塑复合材料的加工和研究

发布时间：2018-03-06 11:50

本文选题：木质纤维　切入点：组分组成　出处：《北京化工大学》2016年硕士论文　论文类型：学位论文

【摘要】：木质纤维在木塑复合材料中的应用广泛,目前缺乏系统的研究。本文通过对多种来源的木质纤维进行系统的研究,建立了木塑复合材料性能的预测模型,可以为木质纤维在木塑复合材料中的应用提供参考。首先,本文在前人的研究基础上,对现有的甜高粱木塑复合材料工艺进行了优化,并进行了生物炭和玻璃纤维改性的探索。原料方面,主要考察了原料的残余糖分和粒径对木塑性能的影响,残余糖分采用水洗预处理,粒径应在80目为宜。相容剂方面,经过对比发现加入3%的MA-HDPE,更适用本实验的木塑体系。改性增强方面,当生物炭的添加量为13.8%时,弯曲模量的最大增长率为11.8%；当玻璃纤维添加量为20%时,弯曲模量的增长率达到61.6%,但综合考虑15%为最优的加入量。然后,对不同来源的木质纤维的性质进行了多方面的研究,旨在系统地探究木质纤维组分组成对木塑复合材料的性能影响。探究了玉米生长时间、品种、生长部位三个维度对玉米纤维组成的影响,其中不同生长部位的评价结果表明：玉米杆和玉米芯制备木塑的性能最优。不同来源的木质纤维的考察表明玉米杆和高粱杆制备木塑复合材料的性能最优。当两种原料进行物理复配时,木塑复合材料的性能为两种原料平均值。纤维素和木质素单独复配时,纤维素含量40%时复合材料性能最优。最后,采用偏最小二乘法等分析方法分析了木质纤维组分组成和材料力学性能两者间的线性相关程度,并利用神经网络成功地建立了材料性能的预测模型,预测精度在±20%-30%。
[Abstract]:Wood fibers are widely used in wood-plastic composites, but lack of systematic research at present. In this paper, a prediction model of wood-plastic composite properties is established through systematic study of wood fibers from various sources. It can provide reference for the application of wood fiber in wood-plastic composite. Firstly, based on the previous research, the existing technology of sweet sorghum wood-plastic composite is optimized. The effects of residual sugar and particle size on the properties of wood and plastic were investigated. The residual sugar was pretreated with water washing, and the particle size should be 80 mesh. It is found that MA-HDPE with 3% is more suitable for the wood-plastic system of this experiment. In the aspect of modification and reinforcement, the maximum growth rate of flexural modulus is 11.8when the addition of biochar is 13.8, and when the amount of glass fiber is 20g, the maximum growth rate of flexural modulus is 11.8. The growth rate of flexural modulus reached 61.6%, but 15% was considered as the optimal addition. Then, the properties of wood fibers from different sources were studied in many aspects. The purpose of this study was to investigate the effects of wood fiber composition on the properties of wood-plastic composites, and to explore the effects of three dimensions of maize growth time, variety and position on the fiber composition. The evaluation results of different growth sites showed that the properties of wood plastic prepared by corn rod and corn cob were the best. The investigation of wood fiber from different sources showed that the properties of wood plastic composite prepared by corn rod and sorghum rod were the best. When the raw materials are physically compounded, The properties of wood-plastic composites are the average of two kinds of raw materials. When cellulose and lignin are mixed separately, the properties of the composites are the best when the cellulose content is 40. Finally, The linear correlation between the composition of wood fibers and the mechanical properties of materials was analyzed by partial least square method, and the prediction model of material properties was successfully established by using neural network. The prediction accuracy was 卤20-30.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TB332

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