Preparation And Characterization Of Thermosetting Hollow Phenolic Micro-Spheres

The hollow phenolic micro-spheres are widely used as surface heat-insulating coating materials of the aircraft due to their excellent properties of high heat-insulating and low specific weight. In this paper a novel method was established for the manufacture of hollow micro-spheres, which mainly involved paraffin oil bath under magnetic rotor stir; serial systematical investigation was carried out on the manufacturing technologies applied to the preparation of hollow micro-spheres. The manufacturing formula of hollow micro-spheres was optimized and then hollow micro-spheres with complete sphere structure and excellent properties were successfully prepared.Effects of factors such as the amount of catalyst, formaldehyde-to -phenol molar ratio during resole synthesis and reaction time at 75 ℃ were primarily studied to investigate how they influenced the syntheses and...