P-DADMAC的合成及其助留助滤作用的研究

Synthesis of P-DADMAC and its Application as Drainage and Retention Aids

探讨了引发剂用量、反应温度、反应时间、通氮气时间等因素对P-DADMAC相对分子质量的影响,以及相对分子质量和溶液pH值对电荷密度的影响;研究了P-DADMAC对浆料的助留助滤作用,以及作为阴离子杂质捕捉剂时与CPAM的协同作用。结果表明,在引发剂用量为0.75%、反应温度50℃、反应时间5h时,P-DADMAC相对分子质量较大,通氮气10min即可基本排除体系内的氧气。合成的P-DADMAC的相对分子质量越大,其电荷密度越高;P-DADMAC溶液的pH值对其电荷密度没有影响。随P-DADMAC相对分子质量及用量的增加,其助留助滤作用增强;作为阴离子杂质捕捉剂可以显著改善CPAM的助留助滤作用。

The method of synthesis of P-DADMAC, the factors such as dosage of initiator, reaction temperature, reaction time and nitrogen feeding, the relationship between relative molecular weight and charge density, the effect of pH value on the charge density were studied. P-DADMAC was used as drainage and retention aids and anionic trash catcher（ATC）. The results showed that when the amount of initiator was 0.75% , temperature was 50℃, and time of reaction was 5 h, relative molecular weight of P-DADMAC was the highest. 10 min of nitrogen feeding was enough. The higher the relative molecular weight of P-DADMAC, the higher charge density, pH value of P-DADMAC solution had no effect on its charge density. Filler retention and drainability increased as relative molecular weight and dosage of P-DADMAC increased. When P-DADMAC was used as.ATC, efficiency of CPAM as drainage and retention aids was improved obviously.