发泡丁腈橡胶-金属密封板的制备

针对发泡橡胶-金属密封板的泡孔不均匀而导致的密封板密封性较差的问题,采用丁腈橡胶为涂覆层,不锈钢板为基体制备发泡丁腈橡胶-金属密封板,分别研究时间、温度、发泡剂用量和环氧树脂用量四个单因素对涂覆橡胶发泡率的影响,采用正交实验优化出最佳工艺条件为:发泡剂用量10%、环氧树脂用量30%、硫化温度140 ℃和硫化时间20 min.200 ℃热稳定性实验结果表明,密封板不起皮、失重为0.08 g; 偏光显微镜研究密封板的微观形貌表明,泡孔平均直径为68.35 μm,发泡均匀,有助于密封性能的提高.

Preparation of foaming nitrile butadiene rubber metal sealing board

For the poorer sealing property of foaming rubber-metal sealing board caused by inhomogeneous bubble, the foaming rubber-metal sealing board was prepared by taking nitrile-butadiene rubber(NBR)as coating layer and stainless steel plate as matrix. The influence of four single factors including the time, temperature, foaming agent content and epoxy resin content on the foaming rate of coating rubber was studied, respectively. The optimal technological conditions optimized with the orthogonal experiments are 10% of foaming agent, 30% of epoxy resin, sulfuration temperature of 140 ℃ and sulfuration temperature of 20 min. The results of thermal stability experiments at 200 ℃ indicate that the sealing board has no peeling and the weight loss is 0.08 g. The observations on the microscopic morphologies of sealing board with polarization microscope reveal that the average bubble diameter is 68.35 μm and the foaming is homogeneous, which is beneficial for the improvement in the sealing property.