耐盐型吸水膨胀丁腈橡胶的制备与性能

Preparation and properties of salinity resistant water-swelling nitrile rubber

以丁腈橡胶为基胶、聚丙烯酸钠为吸水树脂(SAP)、乙二胺四乙酸二钠(EDTA-2 Na)为金属离子封闭剂,与聚乙二醇和二苯基甲烷二异氰酸酯混合物共混制得耐盐型吸水膨胀橡胶(WSR),分别考察了聚氨酯(PU)生成量、EDTA-2 Na和聚丙烯酸钠用量对WSR物理机械性能及矿化度水中吸水膨胀性能的影响。结果表明,随着PU生成量的增加,WSR的拉伸强度降低,扯断伸长率增加,邵尔A硬度增大,吸水膨胀性能先提高后下降,PU最佳生成量为15份;随着EDTA-2 Na或SAP用量的增加,WSR的拉伸强度降低,最大质量吸水率增大,EDTA-2 Na和SAP最佳用量分别为15份和70份。

Water-swelling rubber（WSR） was prepared by blending nitrile rubber and mixture of polyethylene glycol and diphenylmethane diisocyanate with poly（sodium acrylate） as water-absorption resin（SAP）,ethylenediaminetetraacetic acid disodium（EDTA-2 Na） as metal ion chelating agent.The influences of the amount of resultant polyurethane（PU）,EDTA-2 Na and SAP on mechanical properties and water-swelling behaviors of WSR were investigated.The results showed that with increasing PU amount,tensile strength decreased,elongation at break and Shore A hardness increased,the maximal mass fraction of water-absorption increased first and then reduced,and the optimum amount of PU was 15 phr.With the increase of EDTA-2 Na or SAP,tensile strength decreased and the maximal mass fraction of water absorption increased,the optimum amount of EDTA-2 Na and SAP were 15,70 phr,respectively.