HDPE%2f木粉复合发泡材料的制备与性能研究.pdf

浙江大学硕:士=学位论文摘要木塑复合材料是以木材与塑料为基体材料,外加其他添加剂混合而成的复合材料。此种材料综合了木材与塑料二者的优点并较为成功地克服了二者的缺点, 而且可以由废弃的塑料和木材制备得到,因此具有良好的应用前景,对于缓解环境的压力具有一定的积极作用。当前木塑复合发泡材料主要以聚氯乙烯为基体。聚乙烯是目前全球应用量最大的通用塑料,因此本文主要针高密度对聚乙烯(HDPE)/木粉发泡复合材料的制备和性能进行研究。本文中HDPE/木粉复合发泡材料是通过双辊开炼机将HDPE、木粉以及其他添加剂混炼,后将其放入平板硫化机中升温加压制备而得到的。首先对双辊开炼机上Jjn-r工艺进行了摸索,因为发泡剂分解温度与马来酸酐接枝聚乙烯的加工温度接近,所以温度控制成为关键,实验结果表明:最适合的加工温度为165℃, 发泡剂最后加入较为适宜。后对制备发泡材料过程中的压力和温度进行了一定的摸索,结果表明:在160℃、20MPa下制备发泡材料较为适宜。研究了相容剂的加入对材料泡孔直径分布以及发泡材料力学性能的影响。发现随着相容剂的加入,材料泡孔直径的分布变得不均匀,其力学性能最大值均出现在相容剂含量为5%时,与未发泡材料比较,其冲击强度和弯曲强度均有一定的下降,并且随着相容剂的加入,二者的差距逐渐增大。研究了交联剂(DCP)的加入对材料泡孔直径分布以及力学性能的影响,结果发现,交联剂显著地阻碍了发泡过程的进行,交联剂加入量较少时材料的密度变化并不明显,%时,材料中泡孔数目明显变少, %时材料中没有泡孔的存在。交联剂的加入使得材料泡孔直径的分布变得更加均匀,且能明显的提高材料的冲击强度;对弯曲性能的影响不大。关键词:木塑复合发泡材料;相容剂;交联剂;泡孔直径分布;力学性能 Abstract The wood-posite(WPC)is based on thewood fiberand theplastics with kindofmaterialintegrates themeritsand es thedemerits ofthewood ,the material,which Can bemade by thewaste wood andplastics,also plays apositive roleintheenvironment protection. Presently,the foamed wood-posites are mostly based on density polyethylene(HDPE)is the most used plastics in0111"life,SO inthisarticle HDPE Was usedas thematrix tostudy itsprocessing condition,mechanical property and the structure ofthefoams. Inthisarticlethe two rollmillWas used tomixtheHDPE,wood powder and other posites were made appropriate conditions on thetwo rollmill were key thctor was temperature control,because the AC’S posing temperature Was close tothe melting point resultsshowed that Wasappropriate tomix the law materials at 65"(2andput thefoaming agents temperature was 60*C withthepressure of20MPa on thefiatvulcanizer tomake the posite. The influence patibilizerMAPE(PE grafted withwithmaleicanhydrid) tothemeandiameter’S distribution of thefoamsand themechanical properties ofthe foamed material were resultsshowed th