阳离子丙烯酸酯乳液纸张增强剂的性能及对纸张的增强作用

Polymerization of Cationic Polyacrylic Ester and Its Performance as a Paper Strength Agent

以苯乙烯、丙烯酸酯和自制阳离子组分为主要原料,通过乳液聚合合成了CSA-4和CSA-15两种阳离子纸张增强剂,通过粒径、粒径分布、Zeta电位、阴离子需求度和纸张物理性能检测手段对两种乳液进行了表征.实验证明:由于CSA-4在合成中阳离子单体的比例大于CSA-15,结果导致其阳离子度和Zeta电位高于CSA-15,而颗粒的粒径和多分散性低于CSA-15.较高的阳离子度和Zeta电位及较小的颗粒使其对纸张的耐折度和抗张强度的增强幅度高于CSB-15,在纸浆中的最佳用量为0.5%.但CSA-4颗粒带弱正电荷,靠自身的阳离子性吸附在纤维表面上有一定困难,所以在应用中需添加助留剂提高其留着率.

Paper strength agents,CSB-4and CSB-15,were prepared from styrene,acrylate,cationic substance and other chemicals by using of emulsion polymerization. Properties of the strength agent and the physical performance of paper were characterized by particle size, particle polydispersity, Zeta potential, charge titration and other paper testing equipment. It is found that CSB-4 has higher cation charge and Zeta potential, lower particle size and polydispersity than CSB-15, since CSB-4 has more cation monomer ratios in polymerization. CSB-4 shows the excellent effect in folding strength and tensile strength enhancement. Optimization dosage of CSB-4 is 0.5%. But, CSA-4 is difficult to be absorbed on the fiber surface because of its weak cationic charge and Zeta potential, the retention agents are needed in the papermaking process.