中低温煤焦油沥青合成沥青树脂的研究

Synthesis of pitch resin from mid-low-temperature coal tar pitch

炭材料是一种重要的功能和结构材料,能否保障炭材料制品质量的关键在于使用粘结剂性能的好坏,沥青树脂粘结剂因与炭素材料有良好的亲和性而倍受国内外学者的广泛关注.以中低温煤焦油沥青为原料,多聚甲醛为交联剂,对甲苯磺酸为催化剂合成沥青树脂.考察了合成条件对沥青树脂的软化点、结焦值和β树脂等指标的影响,采用FT-IR表征了沥青树脂的合成机理.研究结果表明,中低温煤焦油沥青与多聚甲醛发生了阳离子型缩聚反应,沥青树脂的软化点在136.2～177.3℃、结焦值在27.64％～38.05％、β树脂在22.79％～41.89％可以进行调控.

The carbon material is an important functional and structural material. The key that can guarantee the properties of carbon material products lies in the performances of its binder. Because of good affinity with carbon material, the pitch resin binder has been concerned by scholars at home and abroad. A pitch resin is synthesized by using mid-low-temperature coal tar pitch as raw materials and paraformaldehyde as cross-linking agent at the presence of p-toluenesulfonic acid. The effects of synthesis conditions on the properties of the pitch resin such as softening point, β-resin and coking value are investigated by single factor experiments. The synthesis mechanism of the pitch resin is characterized by Fourier transform infrared spectroscopy （FT-IR）. The results show that the polycondensation reaction of synthesizing the pitch resin is a cation type polycondensation reaction, the softening point is between 136.2 ℃ and 177.3℃, the coking value is between 27.64% and 38.05%, and β-resin is between 22.79% and 41.89%.