聚氨酯砂改性工艺研究

采用红外光谱技术研究了聚氨酯砂的固化反应机理， 通过向聚氨酯砂中加入呋喃树脂砂进行改性处理， 并采用热失重及扫描电子显微分析技术研究了聚氨酯砂的改性机理。结果表明， 聚氨酯砂中加入呋喃树脂砂以后， 由于在高温下树脂膜分解速度下降， 高温强度得到提高。呋喃树脂砂合适加入量为１０ ％ ， 改性聚氨酯砂具有良好的综合性能

Modifying technology of polyurethane resin sand

The solidifying reaction of the polyurethane resin was studied by means of infrared light spectrum. The furan resin sand was added into the polyurethane resin sand to increase its high temperature compression strength, the modified mechanism of polyurethane resin sand was studied by using thermogravimetry and scanning electron microscopy. As the decomposition rate of the resin film which covered the sand was decreased, the high temperature compression strength of polyurethane resin sand was increased when the furan resin sand was added into. The optimum addition of furan resin sand was 10%, and the combination property of modified polyurethane resin sand was better. The solidifying reaction of the polyurethane resin was studied by means of infrared light spectrum. The furan resin sand was added into the polyurethane resin sand to increase its high temperature compression strength, the modified mechanism of polyurethane resin sand was studied by using thermogravimetry and scanning electron microscopy. As the decomposition rate of the resin film which covered the sand was decreased, the high temperature compression strength of polyurethane resin sand was increased when the furan resin sand was added into. The optimum addition of furan resin sand was 10%, and the combination property of modified polyurethane resin sand was better.