填料对EPDM橡胶流变性能的影响及其流变方程  

Effects of Fillers on the Rheological Properties of EPDM Rubber and the Rheological Equations

作　　者：李军强[1] 刘奔奔 陈国辉[1] 杨士山[1] 何吉宇[2,3] 李向梅 杨荣杰[2,3] LI Jun-qiang;LIU Ben-ben;CHEN Guo-hui;YANG Shi-shan;HE Ji-yu;LI Xiang-mei;YANG Rong-jie(Xi′an Modern Chemistry Research Institute,Xi′an 710065,China;School of Material Science and Engineering,Beijing Institute of Technology,Beijing 100081,China;National Engineering Research Center of Flame Retardant Material,Beijing 100081,China)

机构地区：[1]西安近代化学研究所,陕西西安710065 [2]北京理工大学材料学院,北京100081 [3]国家阻燃材料工程技术研究中心,北京100081

出　　处：《火炸药学报》2021年第4期526-531,共6页Chinese Journal of Explosives & Propellants

基　　金：基础产品创新计划。

摘　　要：为了研究填料对三元乙丙橡胶(EPDM)流变性能的影响,使用毛细管流变仪测试了白炭黑、含磷阻燃剂APP与MPP,酚醛树脂(FB)4种填料对其流变性能的影响;同时采用Bird-Carrea幂律方程表征了一种包覆层配方黏度与剪切速率和温度的关系。结果表明,填料加入后体系黏度大幅度增加,流动指数(n)明显下降;阻燃剂APP和MPP使得基体黏度系数(K)从5.5×10^(4)增至3.8×10^(5),n从0.4降低至0.27左右;白炭黑和酚醛树脂对黏度影响最为显著,K增至3.8×10^(5),n降低至0.17左右;虽然填料使得基体黏度急剧增大,但是可以通过增加剪切速率来降低黏度,这也是填料加入体系仍能成型加工的基础;由于有机填料酚醛树脂本身对温度的敏感性,可通过升温降低此类体系黏度,150℃时体系黏度下降至与空白EDPM相当。In order to study the effect of filler on the rheological properties of ethylene propylene diene monomer(EPDM),the effects of white carbon black(silica),phosphorus-containing flame retardants APP and MPP,and phenolic resin(FB)on the rheological properties of EPDM were studied by using capillary rheometer.At the same time,the Bird-Carreau equation was used to express the viscosity of a coating formulation on the shear rate and temperature dependence.The experimental results show that the viscosity of the system increases significantly after the filler is added,and the flow index(n)decreases significantly.The flame retardants APP and MPP make the consistency coefficient(K)increase from 5.5×10^(4) to 3.8×10^(5),and n decrease from 0.4 to about 0.27.The white carbon black and phenolic resin have the most significant effect on the viscosity of the system,with K increasing to 3.8×10^(5) and n decreasing to about 0.17.Therefore,although the filler makes the viscosity of the matrix increase sharply,the viscosity can be reduced by increasing the shear rate,which is also the basis for the filler to be added to the system to still be able to form and process.Among them,due to the sensitivity of organic filler phenolic resin to temperature,the viscosity of this type of system can be reduced by raising the temperature.At 150℃,the viscosity of the system drops to the equivalent of blank EDPM.

关 键 词：材料科学 三元乙丙橡胶 EPDM 包覆层 填料 流变性能 流变方程 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] O34[理学—固体力学]