铝铵基阳离子淀粉的制备与应用

实验利用水溶剂法,以普通阳离子淀粉（CS）、二甲基二烯丙基氯化铵单体（DADMAC）、铝溶胶为原料,硝酸铈铵（CAN）为引发剂,制备了铝铵基阳离子淀粉（ACS）。研究了引发剂用量、单体用量、反应温度、反应时间等对接枝反应的影响。研究发现最佳的反应条件为：引发剂用量为0.54%,单体用量为50%,铝溶胶加入量为3.5%,反应温度为55℃,反应时间为3 h,m（H2O）∶m（St）=2∶1,可制得氮含量约为0.58%的ACS,高于普通的阳离子淀粉CS（0.30%）。用紫外分光光度法测定产品的铝含量并采用红外光谱对接枝共聚物进行了结构分析。将铝铵基阳离子淀粉应用于脱墨浆中,最低白水浊度为5.2 NTU;最高灰分含量为23.27%。在用量低于0.5%时,能同时提高纸张的强度和细小纤维的留着率,具有助留和增强的双重作用。通过在浆中加入相同量的ACS和CS进行比较,发现ACS的絮凝作用和助留效果均优于CS。

The Preparation and Application of Aluminum-ammonium Cationic Starch

In this study an aluminum ammonium cationic starch（ACS） was prepared with water solvent method,using ordinary cationic starch（CS）,diallyl-dimethyl ammonium chloride monomer（DADMAC）,and aluminum sol as raw materials,and cerium ammonium nitrate（CAN） as initiator.The influences of the initiator dosage,monomer content,reaction temperature and reaction time on the grafting reaction were investigated.The optimal reaction conditions were found to be： initiator dosage of 0.54%,monomer content of 50%,aluminum sol content of 3.5%,reaction temperature of 55 ℃,reaction time of 3 h,and H2O∶St of 2∶1.Under these conditions,ACS with nitrogen content of about 0.58% can be obtained,which was much higher than that of the ordinary cationic starch CS（0.30%）.We determined the aluminum content of the graft copolymer with ultraviolet spectrophotometry and used infrared spectroscopy for structural analysis.When the ACS was used in DIP,the lowest white water turbidity was 5.2 NTU and the highest handsheet ash content was 23.27%.Both the handsheet strength and fiber fine retention can be improved when the dosage was less than 0.5%.Under the same dosage levels,both the flocculation and retention of ACS were found to be better than those of CS.