陶瓷浆料用木质素系分散剂的性能及配伍研究

考察了改性木质素磺酸钠GCL3S系列产品对墙地砖陶瓷浆料应用性能的影响,结果表明,GCL3S具有较好的分散稳定性能。当低相对分子质量(以下简称分子量)的GCL3S-1掺量(分散剂占陶瓷粉料的质量分数,下同)为0.3%时,固含量(固体占陶瓷浆体的质量分数,下同)为71.26%的陶瓷浆料流出时间仅为41.79 s,厚化度为1.37;随GCL3S分子量增加,陶瓷浆料性能先提高后降低,重均分子量Mw=27 700的GCL3S-2对浆料的流动性及分散稳定性能最好。GCL3S产品与水玻璃、六偏磷酸钠、焦磷酸钠、三聚磷酸钠复配能进一步提高其应用性能,其中与六偏磷酸钠按质量比1∶1复配,总掺量为0.2%时,陶瓷浆料流出时间仅38.81 s,分散性能明显优于目前常用的无机盐分散剂。

Study on the Performance of Lignin-based Dispersant for Ceramic Slurry and Its Compatibility

The application performance of ceramic slurry blended with modified sodium lignosulfonate GCL3S was studied, and results showed that GCL3S could obviously improve the dispersion and stability performance of the ceramic slurry. When the addition amount of GCL3S-1 is 0.3%, with the outflow time 41.79 s and thickening degree 1.37, the mass fraction of ceramic slurry could reach 71.26%. With the increase of molecular weight, the performance of ceramic slurry was improved firstly and then decreased. GCL3S-2 with Mw about 27700 had the best dispersion and stability performance of the ceramic slurry. When incorporated with sodium silicate, sodium hexametaphosphate, sodium pyrophosphate and sodium tripolyphosphate respectively, GCL3S-1 could further improve the dispersion performance of ceramic slurry. The outflow time of ceramic slurry was only 38.81 s when the mass ratio of GCL3S-1 to sodium hexametaphosphate was 1:1and the total addition amount was 0.2%. It means that the dispersion performance of this composite dispersant was significantly better than that of common inorganic dispersants.