低氮苯酚改性热芯盒呋喃树脂及复合固化剂的研究与应用

Research and Application of Low Nitrogen Phenol-modified Hot-box Furan Resin and Composite Curing Agent

介绍了一种新型低氮苯酚改性热芯盒呋喃树脂的生产方法,改善了目前行业中热芯盒树脂普遍存在的游离甲醛含量高、砂芯强度低、抗湿性差等问题。该方法采用甲醛、尿素、糠醇等原料,通过加入苯酚改性,加成阶段二次补加碱,控制缩聚阶段尿素用量,并在树脂合成后期引入了一种极性有机酯降低树脂黏度,合成出的热芯盒树脂具有氮含量低、黏度小、游离甲醛含量低、砂芯强度高、抗湿性好等特点。

This paper introduces a new type of low-nitrogen and phenol modified hot core box furan resin and it's production methods,which can solve the widespread problems of high content of free formaldehyde,low sand core strength,poor moisture resistance of in hot core box furan resin at present.This method uses formaldehyde,urea,alcohol and other raw materials.By adding modified phenol,and alkali in the second stage,controlling the amount of urea polycond in ensation stage,and adding a polar organic esters in the late stage to reduce the resin's viscosity,the obtained resin was of low nitrogen content and viscosity,low content of free formaldehyde,high sand core strength,and high moisture resistance.