采用玻璃化转变温度(Tg)、温度回缩(TR)、吉门扭转温度和低温压缩永久变形等研究了增塑剂DIDS和增塑剂TP 759分别对HNBR LT 2004和HNBR LT 1757低温性能的影响,并探究了交联网络对低温性能所起的关键作用.结果表明,良好的低温压缩永久变形和TR70取决于硫化胶弹性交联网络,而增塑剂会稀释弹性交联网络.吉门扭转模量和TR10取决于增塑胶料的柔顺性.低温牌号HNBR与增塑剂的结合能拓宽胶料使用温度范围,为低温条件下的密封应用提供更多选择.
The effects of peroxide content, filler on the low temperature properties of HNBR LT 2004, HNBR 3407 and HNBR LT 2004/HNBR 3407 blends were studied by different physical parameters, such as glass transition temperature（T g ）,temperature of retraction（TR）, Gehman and low temperature compression set. The results showed that the low temperature compression set, TR70 and Gehman data of HNBR LT 2004 were affected by filler content and surface activity, and the compound with lower active carbon black had better low temperature flexibility. The compression set at low temperature was significantly improved with the increase of crosslinking density（peroxide content）. Compared with LT grades, HNBR 3407 had higher TR, Gehman and low temperature compression values, but HNBR 3407 still had some remaining flexibility below T g . The HNBR blend of low temperature grades and oil resistant grades could adjust the fluid resistence while maintain good low temperature properties.
The low temperature properties of unfilled and vulcanized hydrogenated nitrile rubber（HNBR） were characterized by different physical parameters, such as glass transition temperature（T g ）,Low temperature retraction（TR）,Gehman and low temperature compression set. The effects of acrylonitrile（ACN） content, residual double bond（RDB） content, crosslinking density and Mooney viscosity on the low temperature properties of rubber were studied. The results showed that the TR value and T g of HNBR varied with the change of ACN content. The low temperature grades showed better low temperature properties because the crystallization of methylene segment was disturbed by the existence of the third monomer. The crosslinking density of rubber had different effects on different low temperature parameters: Gehman value and TR10 were not affected by crosslinking density, however, TR70 and low temperature compression set were significantly improved with the increase of crosslinking density. The double bond content was highly related to the crosslinking density, which showed that the influence of the double bond content on the low temperature performance of rubber was very similar to that of the crosslinking density on the low temperature performance. Gehman, TR10 and T g were not affected by Mooney viscosity, while TR70 was favored by higher Mooney viscosity.
总结了核电厂隔膜常规的失效模式,包括贯穿撕裂、疲劳破坏、分层鼓包以及螺栓孔破坏形式;研究了导致失效的根本原因以及如何控制隔膜质量.结果表明,当隔膜失效时,测试隔膜的拉伸性能、动态疲劳、压缩永久变形、粘合强度、爆破压力及动作寿命试验等,有利于分析出隔膜失效的原因.
