苯基硅油集束剂对中间相沥青纤维不熔化过程影响  

Effect of phenyl-modified polysiloxane oiling agent on stabilization process of mesophase pitch fiber

作　　者：陈龙[1] 刘辉[1] 迟伟东[1] 沈曾民[1] 

机构地区：[1]北京化工大学碳纤维及功能高分子教育部重点实验室国家碳纤维工程技术研究中心,北京100029

出　　处：《炭素技术》2010年第4期36-40,共5页Carbon Techniques

摘　　要：以中间相沥青为原料,通过熔融纺丝、不熔化和炭化处理得到了中间相沥青炭纤维,利用FTIR和TG-DSC手段研究了沥青纤维的不熔化过程。结果表明,沥青纤维在氧化过程中沥青分子与氧反应形成了耐热的氧桥结构,且反应主要发生在200～350℃。利用DSC、SEM、EDS等手段研究了苯基硅油集束剂对中间相沥青纤维不熔化过程的影响。研究结果表明,集束剂很好地改善了纤维间的静电作用,减少了纤维与导辊间的相互摩擦,有效避免纤维表面产生缺陷。同时集束剂还能够很好地改善沥青纤维的集束性和分纤性,使得纤维排列规整性提高。但是在集束剂作用下,纤维丝束密度过大阻碍了纤维束间的气流流动,减缓了反应过程中的热量释放,易导致热点处纤维的融并。当不熔化温度为290℃、集束剂浓度1%时,炭纤维的抗拉强度为1.36GPa。Mesophase pitch carbon fiber was obtained through melt-spinning,stabilization and carbonization from mesophase pitch.The stabilization process is studied by FTIR and TG-DSC.The results show that the surface of pitch fiber forms a stable oxygen-bridge structure,and the reaction occurred mainly in the 200 ～ 350 ℃.The influences of phenyl-modified polysilonxane oiling agent to the pitch fibers oxidative stabilization process were studied by DSC,SEM and EDS.The results show that oiling agents make a good effect lower the electrostatic interaction among the fiber,reducing the mutual friction between the guide rollers and the fiber,effectively minimized the surface defects of fiber.Meanwhile,the oiling agents could improve effectively bundling and separability of pitch fiber,making the regularity of the fibers markedly improved.However,in the function of oiling agents,the increasing of density of fibers may cause contacts of filaments,which would block the flow of gas in the bundle,retarding release of heat,which is generated by the oxidative stabilization,leading to fusion of filaments at the hot spots.Carbon fiber tensile strength is up to 1.36 GPa at stabilization temperature of 290 ℃ and oiling agent concentration of 1% .

关 键 词：炭纤维 中间相沥青 不熔化 集束剂 

分 类 号：TQ536.2[化学工程—煤化学工程]