摘要
为考察金属盐凝固剂对丁基橡胶(isobutylene isoprene rubber,IIR)硫化行为的影响,采用流变仪研究了搅拌破乳及11种金属盐破乳后IIR的硫化历程,并分析了其硫化动力学。研究发现金属盐的阳离子及阴离子种类对硫化过程均有显著影响。与传统Ca^(2+)凝固剂相比,过渡金属离子Cu^(2+)、Zn^(2+)破乳会延长焦烧期及正硫化时间,降低硫化表观活化能,硫化膜储能模量较高。与搅拌破乳相比,主族金属离子Ca2、Mg2+、Al^(3+)破乳对硫化过程影响较小。阴离子Cl^(-)及NO_(3)^(-)有显著的硫化抑制作用,降低硫化表观速率常数,延长正硫化时间;阴离子SO_(4)^(2-)和OAc^(-)对IIR的硫化历程影响较小,相应的IIR硫化胶具有更高的模量。
In order to explore the effect of metal salt demulsifiers on the vulcanization behavior of isobutylene isoprene rubber(IIR),the vulcanization process of IIR demulsified by stirring and 11 metal salts was measured by a rheometer,and the vulcanization kinetics was analyzed.It was found that the cation and anion species of metal salts had significant effects on the vulcanization process.Compared with traditional Ca^(2+)coagulants,the demulsification of transition metal ions Cu^(2+)and Zn^(2+)can prolong the scorch period and positive vulcanization time,reduce the apparent activation energy of vulcanization,and the storage modulus of the vulcanized film is higher.The demulsification by using the main group metal ions Ca^(2+),Mg^(2+),Al^(3+)has little effect on the vulcanization process of IIR.Chloride ion and nitrate ion have significant vulcanization inhibition,reducing the apparent rate constant of vulcanization,and prolonging the positive vulcanization time.Sulfate ion and acetate ion have little effect on the vulcanization process of IIR,and the corresponding IIR vulcanizates have higher modulus.
作者
饶纤纤
杜淼
单国荣
潘鹏举
RAO Xianxian;DU Miao;SHAN Guorong;PAN Pengju(State Key Laboratory of Chemical Engineering,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,Zhejiang,China;Institute of Zhejiang University-Quzhou,Quzhou 324000,Zhejiang,China;Department of Polymer Science and Engineering,Zhejiang University,Hangzhou 310027,Zhejiang,China)
出处
《化工学报》
EI
CSCD
北大核心
2023年第2期756-765,共10页
CIESC Journal
基金
国家自然科学基金面上项目(51873180)。
