钢结构防火涂料用水基聚氨酯(PU)/蒙脱土(MMT)复合树脂的制备

【作者】 李再峰； 马仝； 马细柳； 崔新荣；

【机构】 青岛科技大学化学与分子工程学院； 山东圣光化工集团；

【摘要】 用一种新型的阳离子聚氨酯聚电解质插层物,通过阳离子交换,得到了一种全新的嵌段聚氨酯/粘土复合物。用傅立叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)和示差扫描热分析(DSC)对材料进行了分析表征。FTIR 的结果表明 MMT 纳米颗粒可以稳定的存在于聚氨酯乳液中。SEM 的结果表明 MMT 颗粒与聚氨酯聚电解质实现了纳米尺度上的复合, 并且聚氨酯聚电解质的链越长,插层效果越好：DSC 的结果显示 MMT 的插层作用导致 PU/MMT 复合材料的玻璃化转变温度较纯 PU 的高,具有较高的热性能。该树脂的硬度为2H,与钢铁的黏结强度为8．9Mpa,是水基钢结构防火涂料的理想成膜树脂。更多还原

【Abstract】 A new type of cationic polyurethane polyelectrolyte used as intercalation compound exchanged with cation between layers of silicates.A novel segmented polyurethane/clay (PU/clay) composite were obtained by means of assistant supersonic technology in cation exchanging process.It was characterized by forurier-transform infrared spectroscopy (FTIR),scanning electron microcopy (SEM) and differential scanning calorimetry (DSC).The result of FTIR showed that the MMT nano solids could be present stably in PU dispersion colloid,and the image of SEM showed that MMT solids were composed with PUD polymer in nano-size,and the longer the chain size of cationic polyurethane polyelectrolyte,the better intercalative effect it behaved.DSC data showed that the glass transition temperature of the PU/MMT increased because of the presence of MMT solids,and the PU/MMT composite performed the better thermal stability than the pure PU.The PUD resin with hardness of 2H and the adhesives strength of 8.9Mpa is desirable coating for steel construction.更多还原