NR和CIIR呼吸器罩体材料性能研究

Properties of Faceblank Materials for Respirators Based on NR and CIIR

本文对两种常用呼吸器罩体材料的性能进行了研究。结果表明在目前的生产配方及硫化条件下,NR罩体材料的拉伸强度为22.0MPa、撕破强力为41.3KN·m-1,高于CIIR罩体材料的13.2MPa和35.5KN·m-1。NR罩体具有较高力学性能的原因在于其能够产生应变诱导结晶;NR罩体和CIIR罩体材料的回弹率分别为60%和16%,芥子气在两种罩体中的扩散系数分别为6.85×10-13m2/s和2.10×10-11m2/s,CIIR罩体材料较低的回弹率和优良的阻隔性能均与分子结构中占优的异丁烯链节上密集的侧甲基有关;NR罩体和CIIR罩体材料的Tg分别为-55℃和-36℃,说明NR罩体具有较好的低温使用性能,较大内摩擦损耗所导致的分子链运动能力减弱是CIIR罩体材料Tg较高的主要原因。

This paper presents properties of faceblanks for two commonly used respirators based on NR and CIIR. The results show that under the existing practrical formula and curing conditions, NR faceblank offers tensile strength of 22.0MPa and tear force of 41.3KN·m-1, higher than those offered by CIIR faceblank which are13.2MPa and 35.5KN·m-1, the mechanical superiority of NR faceblank is mainly derived from the strain-induced cyrstallization. Resiliences of NR and CIIR faceblanks are 60% and 16%, and diffusion coefficients of sulphur mustard in the two faceblanks are 2.10 ×10-11m2/s and 6.85 ×10-13m2/s, respectively. Low resilience and excellent barrier property of CIIR faceblank are due to the dense side methyl groups in the predominant isobutylene units.The Tg values for the NR and CIIR faceblank are-55℃ and-36℃, suggesting the NR faceblank having a fairly good performance than the CIIR faceblank in cold weather. The weak chain segment motion ability originated from great internal friction is responsible for the high Tg value for CIIR faceblank.