摘要
分别采用一段和两段模压法制备了以顺丁橡胶(BR)/丁苯橡胶(SBR)/天然橡胶(NR)为基体的橡胶发泡材料,研究了三种化学发泡剂N,N′-二甲基戊次甲基四胺(H)、4,4′-氧代双(苯磺酰肼)(OBSH)以及H/OBSH(质量比1∶1)复配对发泡及硫化特性的影响,以及3种发泡剂和2种成型工艺对收缩率及相结构的影响。结果表明,发泡剂H对硫化性能影响最大,含发泡剂H的混炼胶在分解过程中释放的热量最多;加入3种发泡剂都具有一种较大的泡孔镶嵌在较小的泡孔丛中的泡孔形态;密度和线收缩率均随着时间的增加而增加,经H/OBSH复配的发泡剂更适合该体系成型,材料线收缩率均比单独使用H和OBSH小,两段模压法可以有效地提高发泡材料的尺寸稳定性,收缩率降低至3.88%,同时发泡剂使用率最多可提高31.67%。
The blends of 1,4-cis polybutadiene rubbers（BR）, styrene-butadiene rubber（SBR）, and natural rubber（NR）foams were prepared by one-stage and/or two-stage compression molding tech niques. The effects of blowing agent H, OBSH and H/OBSH（mass ratio 1 ：1）on the vulcanization and foaming characteristics of the rubber foams were investigated. In addition, the effects of the three blo- wing agents and the two compression molding techniques on the shrinkage and morphology were also studied. The results showed that the rubber had a great influence on the vulcanization and foaming characteristic with blowing agent H, and the gross rubber including of blowing agent H released the maxium heat quantity. The foam articles have the large ceils inlay among the small cells with the three blowing agents. The density and shrinkage of BR/SBR/NR foams were increasing with time delaying. The blowing agent H/OBSH was suitable for the system to shape, and shrinkage of BR/SBR/NR foams was lower with blowing agent H/OBSH SH. The two-stage compression molding could foams, and shrinkage ratio drop to 3.88%, and 31.67% at most. than those of only filling to blowing agent H and OB- improve on the dimensional stability of BR/SBR/NR the utilization ratio of blowing agent could enhance to
出处
《弹性体》
CAS
2013年第1期58-64,共7页
China Elastomerics
基金
国家科技部科研院所技术开发研究专项资金资助项目(2010EG111013)
关键词
橡胶
发泡
化学发泡剂
相结构
收缩率
rubber
foam
chemical blowing agent
morphology
shrinkage
