高黏尼龙66在力学性能、化学稳定性等方面均优于一般尼龙66,具有广阔的市场空间和发展前景。采用分段滴加的方法制备出了高纯度的尼龙66盐,探究了预缩聚温度、预缩聚时间、预缩聚压力、盐溶液pH以及催化剂用量对尼龙66聚合过程及相对黏度的影响,确定了生产高黏尼龙66的工艺条件为预聚温度210℃、预聚时间1h、预聚压力1.8MPa、尼龙盐液pH为7.7、催化剂用量0.1%。所合成的尼龙66的黏度可在2.8～4.7间调节,该高黏尼龙66综合性能优异,热稳定性好,耐磨损,能够满足高黏工程用尼龙66的使用要求。
The mechanical properties and chemical stability of high viscosity nylon 66 are better than those of ordinary nylon 66,thereby possessing broad market potential and development prospects.In this study,a high-purity nylon 66 salt was prepared by segmented dropwise addition method.The effects of pre-polycondensation temperature,pre-polycondensation time,pre-polycondensation pressure,salt solution pH and catalyst dosage on the polymerization process and relative viscosity of nylon 66 were investigated.The process conditions for the production of high viscosity nylon 66 were determined as follows:pre-polymerization temperature of 210℃,pre-polymerization time of 1h,pre-polymerization of pressure 1.8MPa,nylon salt pH value of 7.7,and catalyst dosage of 0.1wt%.The viscosity of the synthesized nylon 66 could be adjusted between 2.8 and 4.7.The high viscosity nylon 66 had excellent comprehensive performance,good thermal stability and wear resistance,meeting the requirements of high viscosity engineering nylon 66.
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