纳米颗粒改性酚醛树脂用于镁碳砖结合剂的研究

Study on nanoparticles modified phenolic resin as magnesite-carbon brick binder

利用纳米粒子对镁碳砖生产用酚醛树脂粘合剂进行了改性。改性树脂常规指标符合镁碳砖结合剂的要求。FE—SEM照片可以看到球形和近球形的纳米颗粒，分散均匀且基本无团聚。制砖实验结果表明，以改性树脂为结合剂能有效地减小显气孔率，增大体积密度且明显提高砖的压缩强度。特别是以TEOS（正硅酸乙酯）和纳米炭黑改性酚醛树脂为结合剂的镁碳砖，经200℃／12h热处理后的常温压缩强度分别提高了38.5％和30.4％，达到了4394MPa和41．35MPa。砖坯的理化性能检测表明，随处理温度的升高，压缩强度和体积密度越来越小，显气孔率越来越大，200-1100℃各指标变化显著，1100-1550℃各指标没有显著变化，但呈变差趋势。

The phenolic resin binder for magnesite-carbon bricks was modified with nanoparticles.The conventional indexes of the modified resin and up to the requirements of magnesite-carbon bricks.FESEM images show that the nanoparticles are dispersed uniformly without agglomeration almost.The physical-chemical property analyses show that the magnesite-carbon brick using this modified phenolic resin as binder possess low apparent porosity,high bulk density and compression strength.Especially,the compression strength of the magnesite-carbon bricks,which are prepared from the resin binders modified with tetraethyl orthosilicate or nano-carbon black,after heat treatment for 200 ℃ae12 h increases to 43.94 MPa and 41.35 MPa,respectively.The results also show that with the increase of heat treatment temperature, the compression strength and the bulk density of magnesite-carbon bricks decrease and the apparent porosity of magnesite-carbon bricks increases.The physical-chemical property shows a significant change when from 200 ℃ae 100℃ ae,the change is not iobviously when from 1 100℃ae 550 ℃aca worse trend with the increase of heat treatment temperature.