Abstract:To solve the leakage problem caused by seal shrinkage or poor compatibility between the lubricant and the rubber sealing materials,the rubber seal swell additives of sulfolane derivatives was studied.Three rubber seal swell additives were prepared using isooctanol,ndecanol,dodecanol as raw materials to react with 3 sulfolene. Based on ASTM D471,the influence on elastomer compatibility was tested for three rubber seal swell additives in Groups Ⅱ,Ⅲ,Ⅳ base oils.The results show that the rubber seal swell additives can effectively improve the shrinkage problem of sealing materials,and change the compatibility between the lubricant and the sealing materials.The short carbon chain seal swell additive possesses more excellent compatibility of sealing materials than the long carbon chain one.