增塑体系对吸水膨胀封隔器性能的影响

Influence of plasticizer on properties of water-swellable packers

以丁腈橡胶(NBR)和吸水树脂为主体材料,通过物理共混法制备的遇水膨胀橡胶,针对其补强和吸水组分较多、加工性能较差的问题,通过添加增塑剂,对其力学性能、膨胀性能以及加工性进行了研究。结果表明,在以硫黄为交联剂的硫化体系内,增塑剂的种类和用量对吸水膨胀橡胶以及封隔器的力学性能、膨胀性能和加工成型性能有直接影响。以3种常用的NBR增塑剂作为研究对象,在实验范围内,吸水树脂含量不变的情况下,邻苯二甲酸二辛酯(DOP)的加入对吸水膨胀橡胶的增塑效果适度,强度衰减较小,对该类橡胶是一种均衡的增塑剂,当DOP用量为10份时,综合性能达到最佳值,拉伸强度为7.6MPa,拉断伸长率为591%,邵尔A硬度为75,常温蒸馏水中体积膨胀率为470%。

Water-swellable rubber（WSR） was prepared using the nitrile rubber （NBR） and super absorbent resin （SAR） as the raw materials by the way of physical mixing.Because of the high proportion of reinforcer and SAR,the processing performance drops.After adding the plasticizer,the mechanical properties and water absorbency of WSR were investigated.Results showed that plasticizer type and proportion directly affect the mechanical properties and water absorption of WSR.We searched three type of plasticizer,while the proportion of SAR was constant.In the experimental range,when DOP was added the strength declined little.When DOP content reaches 10 copies,comprehensive performance can reaches best value,with strength of 7.6 MPa,elongation at break of 591％,hardness of 75HSA,volume expansion ratio of 470％.