【摘要】 本实验选用由乳化剂OP(壬基酚聚氧乙烯醚)与CPB(溴代十六烷基吡啶)所组成的复配分散剂对纳米ZrO2进行分散,制备ZrO2悬浮液,并讨论了复配分散剂两组分用量比、pH值、悬浮液中的离子强度等对悬浮液稳定性的影响。结果表明:加入复配分散剂得到的ZrO2悬浮液,具有更好的分散稳定性;当OP与CPB用量比为1∶1,复配分散剂用量为ZrO2含量的6%时,能使ZrO2粉末具有良好的分散,在pH=1.8时,悬浮液颗粒粒径最小,中位粒径达到178nm。实验中还发现,添加复配分散剂后悬浮液等电点由原来的pH=6右移到pH=13附近,另外,增加悬浮液中的离子强度,使Zeta电位值降低,粒径增大,但离子强度大小并不会影响ZrO2的等电点,其等电点仍保持在13左右。更多还原

【Abstract】 The composite dispersants which were composed of emulsifier OP (poiyoxyethylene Nonylphenol Ether) and CPB (hexadecylpyridinium bromide) were selected by the experiment to carry out the dispersion of the nano ZrO2 and the ZrO2 suspension was prepared,moreover,the effect of the stability of suspension caused by the ratio of the dosage of two constituents of the composite dispersants、pH value、and ion strength of the suspension were discussed. The results showed that the ZrO2 suspension which was added to the composite dispersants had better dispersion and stability.When the ratio of the dosage of OP and CPB was 1∶1,the zirconia powder in the suspension with 6% composite dispersants could be dispersed well,and the particle size of suspension was minimum in the pH=1.8,and the median diameter was 178 nm.It was also found that the isoelectric point of the suspension had shifted from pH=6 to pH=13,after the composite dispersants were added. In addition,the ion strength increased,the value of zeta potential would be reduced,and the particle size would be bigger,but the isoelectric point of ZrO2 suspensions was not affected by the ion strength,it was still maintained about 13.更多还原