DADMAC-AM共聚物的合成及应用

Synthesis and Application of Poly-DADMAC-AM

关键词:  PDA  特性黏度  助留助滤

Key Words:PDA  intrinsic viscosity  retention and drainage

摘要:以二甲基二烯丙基氯化铵(DADMAC)和丙烯酰胺(AM)为原料,采用水溶液聚合法制备Poly-DADMAC-AM(PDA)高阳离子电荷密度的共聚物,并对其用于OCC浆生产瓦楞原纸的助留助滤效果进行了考察。采用NH4S2O8-NaHSO3氧化还原引发体系,在单体质量分数为50%,单体质量比为3∶1(DADMAC∶AM),聚合温度45℃,熟化温度60℃,聚合反应和熟化时间均为3 h,引发剂用量0.33%（相对于单体）的条件下,合成的PDA的特性黏度最高,相对分子质量约150万。以OCC浆为原料,对合成PDA样品的助留助滤效果进行了应用实验,在PDA用量为0.10%的情况下,浆料的打浆度由50°SR下降到23°SR；浆料的单程留着率可以由71.0%提高到79.7%,助留助滤效果显著,且抄造纸张的抗张强度和撕裂度都有所增加。

Abstract:Poly-DADMAC-AM (PDA) was synthesized by aqueous phase polymerization technique using DADMAC and AM as raw materials. The retention and drainage performances of PDA were tested on OCC pulp. The optimal polymerization conditions were: m(DADMAC)∶m(AM)=3∶1, w(NH4S2O8)∶w(DADMAC+AM)=0.33%, the times of polymerization and ripening were 3 hours but the temperatures of polymerization and ripening were 45℃and 60℃ respectively. The molecular weight of the product was about 1.5 million at the optimal conditions. The single pass retention increased from 71.0% to 79.7% and the beating degree reduced from 50°SR to 23°SR while the dosage of the PDA was 0.10% and OCC furnish were used for the testing of the retention and drainage performance. Meanwhile, tenside stiffness and tear strength of paper were all improved.