纳米颗粒改性酚醛树脂用于镁碳砖结合的研究

摘要

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 ℃ l2 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 jobviously when from 1 100℃ ae 550℃ aea worse trend with the increase of heat treatment temperature.%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 ℃/12 h热处理后的常温压缩强度分别提高了38.5％和30.4％,达到了43.94 MPa和41.35 MPa.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,200～1 100℃各指标变化显著,1100～1550℃各指标没有显著变化,但呈变差趋势.