聚环氧琥珀酸对纳米碳酸钙粒子的分散作用

Dispersion effect of polyepoxysuccinic acid on nano calcium carbonate

采用自然沉降法和吸光光度法,研究了聚环氧琥珀酸(PESA)等高分子物质对粒径为60 nm的碳酸钙粉体在水溶液中的分散行为,然后对它们进行复配,并对复配配方的分散性和稳定性进行了研究。研究结果表明PESA对纳米碳酸钙的分散性最好,其次为聚丙烯酸钠、丙烯酸-丙烯酸酯-膦酸-磺酸盐四元共聚物、丙烯酸-丙烯酸酯-磺酸盐和丙烯酸-2-甲基-丙烯酰胺基丙磺酸类共聚物。对PESA与其他几种分散剂进行复配,其中加入与碳酸钙的质量比为1.8%的PESA、0.7%的六偏磷酸钠和0.1%的十二烷基硫酸钠3元复配的分散性能和稳定性最佳。

The effect of different polymer dispersants and their mixtures on the dispersion behavior in aqueous suspensions of calcium carbonate particles with diameter of 60 nm has been investigated by photometric methods and free sedimentation. The results show that the dispersivity of calcium carbonate is much greater with polyepoxysuccinic acid （PESA） than with sodium polyacrylate （PAAS）, PAAPS, AAS and AA/AMPS. Furthermore, the dispersivity of PESA could be further enhanced by combination with other inorganic or organic disper, sants. The optimal dispersivity and stability were obtained for a composite dispersant of composition 1.8 % PESA , 0.7% sodium hexametaphosphate （SHMP） and 0.1% sodium dodecyl sulfatye （SDS）.