(哈爾濱工業(yè)大學(xué)材料科學(xué)與工程學(xué)院，哈爾濱150001)
摘 要: 采用紅外光譜技術(shù)研究了聚氨酯砂的固化反應(yīng)機(jī)理，通過(guò)向聚氨酯砂中加入呋喃樹(shù)脂砂進(jìn)行改性處理，并采用熱失重及掃描電子顯微分析技術(shù)研究了聚氨酯砂的改性機(jī)理。結(jié)果表明，聚氨酯砂中加入呋喃樹(shù)脂砂以后，由于在高溫下樹(shù)脂膜分解速度下降，高溫強(qiáng)度得到提高。呋喃樹(shù)脂砂合適加入量為10%，改性聚氨酯砂具有良好的綜合性能。
關(guān)鍵字: 聚氨酯；改性；高溫抗壓強(qiáng)度
（School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, P.R.China）
Abstract: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.
Key words: polyurethane resin；modification；high-temperature compression strength
