合成条件对萘沥青树脂黏结性能的影响

Effect of synthesis conditions on bonding properties of naphthalene-based pitch resin

以萘为单体,苯甲醛为交联剂,浓硫酸为催化剂,合成了与石墨等炭材料有优良黏结性的萘沥青树脂。实验研究了各因素对萘沥青树脂的软化点、残炭率以及黏结指数等黏结性能的影响。结果表明:萘与苯甲醛适宜的物质的量比为1∶1.0～1.5、适宜的浓硫酸用量为6%～10%(质量分数);缩聚反应温度120～170℃,且反应温度越高,所需反应时间就越短;增加氮气流量能提高缩聚反应速率。在此条件下,合成的萘沥青树脂的软化点26～163℃、残炭率26.8%～59.5%、黏结指数30.5～98.0,收率80%左右。

Naphthalene-based pitch resin which has a good cohesiveness with carbon materials such as graphite has been synthesized by using naphathalene as monomer,benzaldehyde as crosslinking agent in the presence of concentrated sulphuric acid. The effects of the factors on the bonding properties of naphthalene-based pitch resin such as softening point,carbon yield and caking index were investigated. The results showed that the suitable amount of substance ratio of naphathalene and benzaldehyde was 1∶1.0-1.5,the proper usage of concentrated sulphuric acid was 6%-10% （mass fraction）,the polycondensation temperature was 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 30.5-98.0 and the yield of the resin could reached 80%.