Preparation of Epoxy Composite Hollow Microspheres (ECHM) Using Toluenesulfonyl Hydrazide (TSH) as Blowing Agent

摘要

The epoxy composite hollow microspheres (ECHM) was prepared by single emulsion technique. Porofor Toluenesulfonyl hydrazide (TSH) 75 was used as blowing agent. Carbon black was used as filler for polyamide-epoxy adduct matrix, which was reverted ratio of 1:2 epoxy to polyamide. The epoxy mixture (internal phase) was dropped and stirred into a heated corn oil (external phase) to form spherical droplets. These epoxy droplets underwent two simultaneous mechanisms of curing and foaming and became hollow microspheres. As expected, higher TSH content produced lower density of ECHM because of more expansion in ECHM. This fact was also evident from the size of hollow microspheres observed by using scanning electronmicroscope. In addition, high TSH content of 16 phr induced higher thermal properties of ECHM compared to those of ECHM using 8 phr and 12 phr TSH.