摘要
研究用己内酰胺封闭TDI-TMP预聚物来降低游离—NCO含量的方法。试验确定了催化剂的种类及用量、温度、反应时间和封闭剂的用量等对封闭率的影响。选用了SD-101为催化剂,封闭温度80℃,使用理论用量的封闭剂反应3h后,游离—NCO含量降到0 5%(质量分数)以下,符合国际标准要求。
In order to reduce the content of —NCO in prepolymer of TDI-TMP,caprolactam was used to block the —NCO group of prepolymer as the blocking agent.The parameters influencing the blocking reaction were researched,such as the quantity of blocking agent,reaction temperature,the kind and quantity of catalyst.The content of free —NCO in the prepolymer can be reduced to less than 0.5% at the condition that SD-101 was used as catalyst at amount of 0.3%,and reacting 3 hours at 80 ℃.
出处
《化学工业与工程》
CAS
2004年第6期429-431,共3页
Chemical Industry and Engineering
