合成条件对萘沥青树脂粘结性能的影响

In order to prepare naphthalene-based pitch resin which has a good cohesiveness with carbon materials such as graphite, naphathalene-based pitch resin was synthesized by using naphathalene as monomer, benzaldehyde as crosslinking agent in the presence of concentrated sulphuric acid in this paper. Effects of the factors such as reactant ratio, usage of concentrated sulphuric acid, reaction temperature, reaction time and nitrogen flow on the bonding properties of naphthalene-based pitch resin such as softening point, carbon yield and caking index were carefully investigated. Experimental results showed that the suitable mole ratio of naphathalene and benzaldehyde was 1:1.0-1.5, the proper usage of concentrated sulphuric acid was 6-10%; the polycondensation temperature was in the range of 120-170℃, and the reaction needed a shorter time as the reaction temperature was higher. Increasing nitrogen flow could enhance the reaction rate of the polycondensation. under the experimental synthesis conditions, the softening point of the naphathalene-based pitch resin was 26-163℃, its carbon yield was 26.8-59.5%, the caking index was in the range of 30.5-98.0, and the yield of the resin was about 80%.