双螺杆挤出改性胶粉/天然橡胶并用胶的性能研究  

Properties of Modified Rubber Powder by Twin-screw Extrusion/NR Blends

作　　者：曾冬[1] 徐向荣 吴俊青 徐建 薛琰 刘俊亮[1] 张明[1] 陈传忠 田尧 陈璇 ZENG Dong;XU Xiangrong;WU Junqing;XU Jian;XUE Yan;LIU Junliang;ZHANG Ming;CHEN Chuanzhong;TIAN Yao;CHEN Xuan(China(Yangzhou)Material Handling Tech-Engineering Ltd,Yangzhou 225009,China])

机构地区：[1]扬州大学化学化工学院,江苏扬州225002 [2]中德(扬州)输送工程技术有限公司,江苏扬州225009

出　　处：《橡胶工业》2020年第11期839-842,共4页China Rubber Industry

基　　金：国家自然科学基金资助项目(51678292;51273172)。

摘　　要：采用双螺杆挤出改性胶粉,研究挤出转速对挤出改性胶粉/天然橡胶(NR)并用胶性能的影响。结果表明:采用双螺杆挤出,在强剪切力作用下,硫化胶粉的(硫化胶)交联网络结构破坏,随着挤出转速的增大,硫化胶粉的交联密度先迅速下降后趋于稳定;挤出改性胶粉与NR并用形成的“海-岛”结构随着硫化胶粉交联网络结构打开程度的增大逐渐消失,挤出改性胶粉与NR形成了共交联网络结构;硫化胶粉交联网络破坏程度适宜时,挤出改性胶粉易与NR在硫化过程中形成交联网络,并避免硫化胶粉过度降解,从而使得并用胶获得较大的拉伸强度和拉断伸长率。Modified rubber powders was prepared by using twin-screw extruder,and the influence of extrusion speed on the properties of extrusion-modified rubber powders/natural rubber(NR)blends was investigated.The results showed that,with twin-screw extrusion,the cross-linked network structure of rubber powders(vulcanizate)was destroyed under the action of strong shearing force.As the extrusion speed increased,the crosslinking density of rubber powders decreased rapidly and then became stable.The typical“sea-island”structure of extrusion-modified rubber powders/NR blends gradually disappeared as the damage degree of the cross-linked network structure increase.A co-crosslinked network structure was formed between the extrusion-modified powders and NR.When the damage degree of the cross-linked network of rubber powders was appropriate,the cross-linked network between extrusion-modified powders and NR formed easily during the curing process,and excessive degradation of rubber powder was avoided,so that the blends could obtain high tensile strength and elongation at break.

关 键 词：双螺杆挤出 改性 胶粉 天然橡胶 并用胶 交联网络 挤出转速 

分 类 号：TQ335.2[化学工程—橡胶工业] TQ332