萘-萘酚-苯甲醛沥青树脂的合成研究

Synthesis of naphthalene-naphthol-benzaldehyde pitch resin

在浓硫酸的催化作用下,采用阳离子聚合法在萘-苯甲醛二元组分沥青树脂分子链上引入了萘酚分子,合成了萘-萘酚-苯甲醛三元组分沥青树脂。用FT-IR光谱仪表征了合成树脂的结构。通过单因素实验,考察了合成条件对沥青树脂软化点、结焦值和黏结强度等黏结性能的影响规律。实验结果表明,合成萘-萘酚-苯甲醛沥青树脂适宜的工艺条件:萘、萘酚和苯甲醛的物质的量比为0.67∶0.33∶1,反应温度为160℃,反应时间为300 min,催化剂用量为10%。在此条件下,合成沥青树脂的软化点为87.5℃,结焦值为32.1%,黏结强度为41.1。改变反应体系中萘酚的物质的量,能获得具有不同黏结性能的萘-萘酚-苯甲醛三元组分沥青树脂。

Naphthalene-naphthol-benzaldehyde three components pitch resin has been synthesized by cationic polymerization in the presence of concentrated sulfuric acid, in which the naphthol molecule was introduced to the molecular chains of naphthalene - benzaldehyde two components pitch resin. The structure of the pitch resin obtained was characterized by Fourier transform infrared spectroscopy （FT - IR）. The effects of synthesis conditions on the properties of the pitch resin such as softening point, coking value and bond strength were investigated by single factor experiments. Experimental results showed that the suitable technology conditions of synthesizing the naphthalene-naphthol-benzaldehyde pitch resin were： the amount of subatance ratio of naphthalene, naphthol and benzaldehyde 0.67：0.33：1, the reaction temperature 160 ℃, the reaction time 300 min and the usage of catalyst 10%. Under the optimal conditions, the pitch resin exhibits the softening point of 87.5 ℃, coking value of 32.1% and the bond strength of 41.1. The naphthalene - naphthol - benzaldehyde three components pitch resin with different bond properties can be obtained by controlling the substance amount of naphthol in reaction system.