摘要
探讨了热压压力、热压温度以及热压次数对对位芳纶纸强度性能的影响,并利用扫描电镜对热压前后的纸张结构进行观察。结果表明：与芳纶原纸相比,热压后对位芳纶纸的紧度、抗张指数和撕裂指数显著提高,但随热压工艺参数的变化有不同的规律。固定热压温度为160℃,在热压压力为2-5MPa的范围内提高压力,紧度和抗张指数增加不明显,而撕裂指数有下降趋势;固定热压压力为2MPa,在温度120-180℃范围内提高温度,紧度增加幅度不大,而抗张指数和撕裂指数则随温度的升高呈现出先升高后降低的趋势,在温度为140℃时达最大值。较佳的热压工艺为：热压压力2MPa、热压温度140℃、热压次数5次,此时纸张的抗张指数和撕裂指数分别为43.8N.m/g和30.9 mN.m^2/g。
The influences of hot pressing conditions,such as pressure,temperature and number of times,on the strength properties of poly（p-phenylene terephthalamide）— PPTA paper were investigated.The structures of PPTA paper before and after hot pressing were observed by Scanning Electron Microscope.The results showed that the density,tensile index and tear index of PPTA paper after hot pressing increased greatly compared with the PPTA base paper.But their change trends were different as the hot pressing technological parameter changed.When the hot pressing temperature was set at 160℃,as the hot pressing pressure increased from 2MPa to 5MPa,the density and tensile index did not increase significantly,but the tear index declined.When the hot pressing pressure was set at 2MPa,as the hot pressing temperature increased from 120℃ to180℃,the tensile index,breaking length and tear index increased first and then declined,and obtained the maximum values at 140℃.The optimum hot pressing conditions for PPTA paper were as follows： the hot pressing pressure,temperature and number of times were 2MPa,140℃ and 5 times respectively.Under these conditions,the tensile and tear index of PPTA paper were 43.8N·m/g and 30.9 mN·m2/g respectively.
出处
《造纸科学与技术》
北大核心
2010年第6期61-64,76,共5页
Paper Science & Technology
基金
国家973项目(2010BC732206)
华南理工大学制浆造纸工程国家重点实验室自主研究课题资助项目
