交联键类型对聚氨酯橡胶定伸应力的影响  

Influence of cross-linking bond types on tensile stress of mixed polyurethane rubber

作　　者：杜伟 邓涛[1] Du Wei;Deng Tao(Qingdao University of Science&Technology,Qingdao 266042,Shandong,China)

机构地区：[1]青岛科技大学高分子科学与工程学院,山东青岛266042

出　　处：《橡塑技术与装备》2022年第9期55-60,共6页China Rubber/Plastics Technology and Equipment

摘　　要：实验探索了在不同种类硫化体系下形成的不同类型交联键对混炼型聚氨酯橡胶(MPU)定伸应力的影响。实验通过设计不同的硫化体系得到不同交联结构的MPU硫化胶,其中包括高硫低促、普通硫磺、低硫高促、过氧化物硫化体系。随着促进剂:硫磺比例的增加,硫磺的利用率和交联效率逐渐增加,硫化橡胶中主要的交联结构也由多硫键向单硫键转变。实验研究了在每一种硫化体系下交联密度对定伸应力的线性关系,且四组硫化体系横向对比发现,交联键键能的大小与线性模型中的斜率K值有相关性,呈正相关。The effects of different types of cross-linking bonds formed under different types of vulcanization systems on the tensile stress of mixed polyurethane rubber(MPU)were investigated experimentally.In the experiment,MPU vulcanizates with different cross-linked structures were obtained by designing different vulcanization systems,including high-sulfur and low-acceleration,ordinary sulfur,low-sulfur and highacceleration,and peroxide vulcanization systems.With the increase of the ratio of accelerator and sulfur,the utilization rate of sulfur and the crosslinking efficiency gradually increased,and the main crosslinking structure in the vulcanizate also changed from polysulfide bond to monosulfide bond.The linear relationship of crosslink density to tensile stress was investigated experimentally for each vulcanization system.Through the lateral comparison of the four groups of vulcanization systems,it is found that the magnitude of the cross-linking bond energy has a positive correlation with the slope K value in the linear model.

关 键 词：混炼型聚氨酯橡胶(MPU) 交联键类型 交联密度 定伸应力 线性关系 

分 类 号：TQ333.99[化学工程—橡胶工业]