炭纤维和废弃聚乙烯在沥青中的分散行为及其性能（英文）  

Modification of asphalt by dispersing waste polyethylene and carbon fibers in it

作　　者：张茂荣[1,2] 方长青[1,2] 周世生[1,2] 程有亮[2] 胡京博[1,2] 

机构地区：[1]西安理工大学机械与精密仪器工程学院,陕西西安710048 [2]西安理工大学印刷包装与数字媒体学院.陕西西安710048

出　　处：《新型炭材料》2016年第4期424-430,共7页New Carbon Materials

基　　金：国家自然科学基金(51172180,51372200);新世纪优秀人才支持计划(NCET-12-1045);陕西省教育厅服务地方专项计划项目(2013JC19);西安理工大学优博基金资助项目(102-211208)~~

摘　　要：聚丙烯腈基炭纤维和废弃聚乙烯作为改性剂,采用热熔共混、絮凝处理、熔融共挤3种工艺对道路沥青进行改性,并研究了炭纤维分散性对沥青性能的影响。研究表明:炭纤维和废弃聚乙烯对沥青的改性为物理改性,随着炭纤维含量的增加,改性沥青的软化点和延度上升,针入度降低,改性沥青高温性能得到改善。过高的炭纤维含量将不利于分散而发生纤维团聚,当炭纤维含量超过0.1%,将造成改性沥青性能降低。微观观察发现,熔融共挤工艺较其他工艺,炭纤维与聚乙烯能较好的分散和结合,使得聚乙烯与炭纤维形成良好的类荆棘状吸附,在沥青中分散最佳,改性沥青的高温性和抗车辙性能得到较大提高。Recycled waste packaging polyethylene（ WPE） and chopped polyacrylonitrile-based carbon fibers（ PAN-CFs） were dispersed in molten asphalt at 170 ℃ with a shearing machine at 3 800 r/min for 60 min to modify its properties to meet the demands of motorway paving. WPE and PAN-CFs were mixed by three methods before the dispersion：（ a） simple blending,（ b） first dissolving WPE in xylene,then mixing and evaporating and（ c） blending and extrusion to rods of 1mm diameterat 170 ℃ which were fed directly into the hot asphalt. The PAN-CF content was varied in the range 0 to 0. 12 wt% while the WPE content was constant（ 4 wt%）. Results indicate that WPE and PAN-CFs are dispersed in asphalt to form a network structure by the xylene-assisted mixing or blending-extrusion methods. The softening points,penetration degree and ductility are improved with increasing content of PAN-CFs up to 0. 1 wt%. Aggregation of the two modifiers occurs beyond 0. 12 wt% of PAN-CFs,which degrades the properties of the modified asphalts. A fiber length of 5 mm is optimum for their best dispersion in the asphalt. Segregation of the modifiers from the modified asphalts can be prevented by increasing the content of PAN-CFs. The blending-extrusion method is best to form a fine network structure,which achieves a best performance. A model is proposed to explain the observed dispersion behavior in asphalt.

关 键 词：包装废PE 炭纤维 复合改性 沥青 

分 类 号：TE626.86[石油与天然气工程—油气加工工程]