通过加入中空微球降低聚硫密封胶的密度,讨论了中空微球及补强对密封胶热老化前后性能的影响。结果表明,加入中空微球后密封胶的密度下降,使用不同微球,密度和硬度差别不大,而仅75#微球有一定的补强作用,密封胶的耐热性急剧下降。补强填料提高了密封胶的密度,热老化前后的各项性能都比无填料体系高。使用A-380拉伸强度提高39%(老化后69%)、伸长率提高15%(老化后95%),同时其热老化前后性能变化率最低,拉伸强度、扯断伸长率、邵A硬度的变化率分别为3%、-84%、108%,优于无填料体系(-15%、-91%、118%);随着CaCO3含量的增加,密封胶的密度提高,热老化前后扯断伸长率均降低、邵A硬度均提高,而拉伸强度呈现先提高、后降低的规律,在含量为20份时最高,达到2.22MPa,比不加提高49%,老化前后的变化率为6%。研制的聚硫密封胶综合性能优异,热老化后质量损失小,仍呈现为弹性的橡胶状。 By adding hollow microspheres to reduce the density of polysulfide sealant, the effects of hollow microspheres and reinforcement on the performance of sealant before and after thermal aging were discussed. The results showed that the density of sealant decreased with the addition of hollow microspheres. The difference of density and hardness was not obvious when different microspheres were used. However, only 75 # microspheres had a certain reinforcing effect, and the sealant’s heat resistance dropped sharply. Reinforcing filler to improve the density of the sealant, the performance before and after heat aging than the high filler-free system. The tensile strength of A-380 was improved by 39% (69% after aging), the elongation increased by 15% (95% after aging), and its performance change rate was lowest before and after heat aging. The tensile strength, elongation at break, The change rates of Shore A hardness were 3%, -84% and 108%, respectively, better than those without filler (-15%, -91% and 118%). With the increase of CaCO3 content, the density of sealant increased, Before and after aging, the elongation at break decreased, the Shore A hardness increased, while the tensile strength first increased and then decreased at the highest content of 20, reaching 2.22MPa, 49% higher than without, before and after aging The rate of change is 6%. Developed polysulfide sealant comprehensive performance, heat aging quality loss is small, still showing elastic rubbery.