26型/246型氟橡胶多段硫化机理及结构与性能  

Multi-stage Curing Mechanisms,Structure and Properties of 26/246 Fluoroelastomers

作　　者：李东翰 段佳玉[2] 张超 徐志宇 方庆红 LI Donghan;DUAN Jiayu;ZHANG Chao;XU Zhiyu;FANG Qinghong(College of Materials Science and Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China;Liaoning Provincial Key Laboratory of Rubber&Elastomer,Shenyang University of Chemical Technology,Shenyang 110142,China)

机构地区：[1]沈阳化工大学材料科学与工程学院,沈阳110142 [2]沈阳化工大学辽宁省橡胶弹性体重点实验室,沈阳110142

出　　处：《材料导报》2021年第12期12202-12208,共7页Materials Reports

基　　金：国家自然科学基金青年基金(52003165);辽宁省博士科研启动基金计划项目(2019-BS-190);辽宁省教育厅青年育苗项目(LQ2019005);辽宁省高等学校创新团队支持计划(LT2016013)。

摘　　要：选用2601氟橡胶(2601FKM)和2461氟橡胶(2461FKM)为原料,N,N′-双亚肉桂基-1,6-己二胺为硫化剂,制备了加工性能优异、强度适中、低温性能好的氟橡胶共混胶。采用氟谱固体核磁(^(19)F MAS-NMR)、红外光谱(ATR-FTIR)分析了2601FKM、2461FKM及其共混胶多段硫化过程中链结构的演变,提出了该共混胶的多段硫化机理。进一步地,对共混胶的硫化特性和交联密度进行了测试分析,并采用差式扫描量热仪(DSC)、热重分析仪(TGA)和拉伸试验对比了一段硫化和二段硫化产物的热性能和拉伸性能。结果表明,2601FKM和2461FKM二段硫化产物交联键含量均高于一段硫化,2461FKM二段硫化产物的交联键含量是2601FKM的1.67倍;当2601FKM/2461FKM共混比为40/60时,硫化产物的玻璃化转变温度(T_(g))均较低,一段硫化产物的T_(g)为-16.5℃,二段硫化产物的T_(g)为-12.1℃,耐低温性良好;随着共混胶中2461FKM用量的增加,两段硫化产物的热分解温度(T_(d))均明显升高;随着共混胶中2461FKM用量的增加,其拉伸强度线性增加。The fluoroelastomers 2601(2601FKM)and 2461(2461FKM)were selected as raw materials and N,N′-disubcinnamyl-1,6-hexylenediamine was chosen as vulcanizator agents to prepare fluoroelastomer blends with excellent processing,moderate strength and better performance at low temperature.Firstly,the evolution of chain structures of 2601FKM,2461FKM and their blends were analyzed by Fluorine Solid-state NMR(^(19) F MAS-NMR)and Atteuated total reflectance/Fourier transform infrared(ATR-FTIR),then the mechanisms of multi-stage curing were proposed.Secondly,the curing characteristics and crosslink density of 2601FKM/2461FKM blends were tested and analyzed,the thermal and tensile properties of the press and post cure products were compared by differential scanning calorimetry(DSC),thermogravimetric analysis(TGA)and tensile tests.The results revealed that crosslinking densities of 2601FKM and 2461FKM post cure products were higher than that of press cure,further the crosslinking density of 2461FKM post cure product was higher than that of 2601FKM about 1.67 times;when the blending ratio of 2601FKM/2461FKM was 40/60,the T_(g) of press cure product was-16.5℃lower than press cure product which was-12.1℃that exhibit better low temperature performance;with the increase of the amount of 2461FKM in blends,curing products T_(d) increased significantly and tensile strength increased linearly.

关 键 词：氟橡胶 多段硫化 硫化机理 

分 类 号：TQ333.93[化学工程—橡胶工业]