Development of a Low-Odor Anaerobic Sealant for Powder Metallurgical Parts

A low odor anaerobic sealant for sealing pores in cast metal and powder metallurgy parts was prepared using polyethylene glycol dimethacrylate and lauryl methacrylate as the main materials, by exploring the effects of formula composition, stirring time and stirring temperature on the performance of the anaerobic sealant. After optimization, the results show that when the weight percent (wt%) of Dicumyl peroxide is 3.0~3.5%, the wt% of acetophenazine is 0.8~1.0%, the stirring time is 2~2.5 hours, and the stirring temperature is 40⁓60℃, the prepared anaerobic sealant fully meets the sealing requirements of the powder metallurgy parts. It has passed all the requirements of MIL-I-17563 Rev.C and also exhibits excellent resistance to acids, caustics, hydrocarbons and solvents. Furthermore, the prepared anaerobic sealant demonstrates a lower cure shrinkage rate, thereby rendering it highly suitable for a diverse array of applications.