发动机进气系统高通量富氧膜的研制

摘要

采用交联改性的方法对较低分子量的乙烯基硅橡胶进行了改性研究,制备了高通量的富氧膜,结合单因素实验法和Design-expert正交实验设计,考察了原料配比、交联反应时间、固化温度和固化时间等因素对富氧膜性能的影响,确定了最佳富氧性能膜的制备条件:原料配比4.3,反应时间2.15h,固化温度86.25℃,固化时间1.75h;获得了富氧浓度为28.68%,透气量为4696.33 barrer的富氧膜,该膜的富氧浓度与常规商品化膜相当,透气量为常规商品化膜的2~4倍,有应用于发动机富氧进气系统的前景.通过扫描电镜检测、机械性能检测等手段对复合膜进行了进一步表征.%The vinyl silicone rubber with low molecular weight was modified by crosslinking modification to prepare an ox-ygen-enrich membrane with high flow performance.With the single factor test and the Design-expert, the influences of the facters of raw material ratio, reaction time, curing temperature and curing time on the prepared membrane were investigated, and the best preparation conditions were determined as follows:the ratio of raw materials is 4.3, the reaction time is 2.15h, the curing temperature is 86.25℃and the curing time is 1.75h.A membrane with the oxygen concentration of 28.68%and the air permeation of 4696.33 barrer was made under the conditions, which could be applied to the oxygen-rich air-intake system of engines.The surface and cross-section of the membrane were observed by scanning electron microscope, respectively.