尼龙66盐/尼龙6T盐的成盐过程分析

摘要

In order to elucidate the formation mechanism of nylon 66 salt/nylon 6T salt, the reaction process of adipic acid (ADA)/p-phthalic acid (PTA) and hexamethylendiamine (HMDA) was studied by real-time measurements of pH and reaction temperature rise. Results show that the reaction of ADA and HMDA to form nylon 66 salt is controlled by the dissolution rate of ADA at T < 40 ℃, and it turns to reaction rate controlled at T > 50℃. The reaction of PTA and HMDA to form nylon 6T salt is controlled by the dissolution rate of PTA within 30~60℃. When ADA and PTA are mixed with HMDA, HMDA reacts with ADA first to produce nylon 66 salt, and then reacts with PTA to form nylon 6T salt.%针对目前尼龙盐成盐过程尚不明确的现状,通过pH和反应温升的实时测量,对己二酸(ADA)和对苯二甲酸(PTA)与己二胺(HMDA)反应生成尼龙66盐/尼龙6T盐的成盐过程进行了研究.结果表明:当温度低于40℃ 时,ADA与HMDA反应生成尼龙66盐的反应是由ADA溶解速率控制,温度高于50℃,则转变为反应控制;而PTA与HMDA的反应在30~60℃内都是由PTA的溶解速率控制.当ADA和PTA同时与HMDA反应时,由于PTA的溶解度比ADA的低,HMDA首先与ADA反应生成尼龙66盐,然后再与PTA反应生成尼龙6T盐.