集束液对中间相沥青纤维的集束性和抗并丝性的影响  

Effects of bundling liquid on bundling and fiber strand properties of mesophase pitch fibers

作　　者：彭密雪 孙祝林 吕永根[1] PENG Mixue;SUN Zhulin;LV Yonggen(0x09State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Donghua University,Shanghai 201620;College of Materials Science and Engineering,Donghua University,Shanghai 201620)

机构地区：[1]东华大学纤维材料改性国家重点实验室,上海201620 [2]东华大学材料科学与工程学院,上海201620

出　　处：《合成纤维工业》2020年第4期1-6,共6页China Synthetic Fiber Industry

基　　金：国家自然科学基金(51672042)。

摘　　要：选用2种中间相沥青为原料,经熔融纺丝得到2种中间相沥青纤维,以乙醇水溶液和二甲基硅油(DSO)水乳液为集束液,对沥青纤维进行集束、干燥、氧化处理,研究了经集束、干燥和氧化后沥青纤维束的集束性和抗并丝性,通过集束液与纤维的接触角、粘附功以及干燥和氧化后纤维的悬垂度表征了集束液的性能及沥青纤维在干燥、氧化过程中的并丝行为。结果表明:沥青纤维的并丝行为与沥青纤维的结构及集束液的性质相关,集束液对沥青纤维的软化和溶解是导致沥青纤维并丝的主要原因,对于氧化起始温度较低的沥青纤维,选择适当的集束液可以达到集束和抗并丝的目的;以乙醇水溶液作为集束液,质量分数小于1.0%时,与纯水相比,其接触角和表面张力减小、粘附功增加,对沥青纤维的集束性好,但质量分数高于5.0%时,因乙醇对沥青纤维的微溶解引起沥青纤维束单丝之间并丝;DSO水乳液作为集束液对沥青纤维的集束能力较好,当DSO质量分数不超过0.01%时,沥青纤维具有集束和抗并丝能力,但因为DSO沸点高,对沥青的溶解作用强,DSO浓度较大时沥青纤维在氧化过程中并丝严重。Two kinds of mesophase pitch were selected as raw materials from which pitch fibers were obtained through melt spinning.The obtained pitch fibers were exposed to bundling,drying and oxidation treatments using ethanol aqueous solution and dimethyl silicone(DSO)water emulsion as bundling liquid.The bundling and fiber strand properties of mesophase pitch fiber tows were studied after bundling,drying and oxidation treatments.The contact angles,work of adhesion and drape degree were used to characterize the performance of bundling liquid and the bundling and stranding behaviors of pitch fibers during drying and oxidation process.The results showed that the stranding behavior of pitch fibers was related to the structure of pitch fiber and the properties of the bundling liquids,the reasons for the pitch fiber strand mainly comprised the softening and dissolution of the pitch fibers by the bundling liquid,and the purpose of bundling and anti-stranding can be achieved by selecting appropriate bundling liquid for the pitch fiber with lower initial oxidation temperature;compared with pure water,ethanol solution as the bundling liquid at a mass fraction of less than 1.0%provided lower contact angle and surface tension and higher adhesion work,and helped the bundling property of pitch fibers,however,the slight dissolution of ethanol on pitch fibers caused the stranding of single fibers when the mass fraction was higher than 5.0%;and DSO water emulsion as bundling liquid contributed better bundling property to pitch fibers,which exhibited the bundling and anti-stranding ability when the mass fraction of DSO did not exceed 0.01%,but the stranding phenomenon of pitch fibers became severe during oxidization process at a high concentration of DSO because of its high boiling point and strong dissolving effect to pitch.

关 键 词：沥青基碳纤维 中间相沥青纤维 集束液 集束性 抗并丝性 

分 类 号：TQ342*.742[化学工程—化纤工业]