阳离子醚化改性聚乙烯醇干强剂的合成及应用

Preparation and Application of Styrene-acrylic Emulsion Modified by Cationic-etherified PVA as a Dry Strength Additive

中文关键词:  阳离子醚化剂  聚乙烯醇  干强剂  无皂乳液聚合

Key Words:cationic etherifying agent  PVA  dry strength additive  emulsifier-free polymerization

中文摘要:

      以聚乙烯醇（PVA）、苯乙烯（St）、丙烯酸丁酯（BA）、丙烯酰胺（AM）为基础单体，甲基丙烯酸羟丙酯（HPMA）为功能单体，甲基丙烯酰氧乙基三甲基氯化铵（DMC）为阳离子功能单体，2,3-环氧丙基三甲基氯化铵（GTMAC）为阳离子醚化剂，采用无皂乳液聚合法合成了阳离子醚化改性聚乙烯醇干强剂乳液；通过透射电镜（TEM）和扫描电镜（SEM）分别对干强剂乳液颗粒形态和纸张纤维形态进行表征和检测。结果表明，当HPMA用量为1.5%（对单体总质量而言，下同）时，干强剂乳液Zeta电位最大，体系较稳定；当GTMAC用量为1.5%时，纸张抗张强度的增幅为24.7%，耐折度的增幅为157%；当HPMA用量为1.5%~2.0%时，纸张的抗张强度和耐折度均较高。

Abstract:

      With poly (vinyl alcohol) (PVA), styrene (St), ethyl acrylate (BA), and acrylamide (AM)as main monomers, hydroxy propyl methacrylate (HPMA) as functional monomer, methacroylcholine chloride (DMC) as cationic-functional monomer, and glycidyl-trimethylammonium chloride (GTMAC) as cationic etherifying agent, the dry strength additive was prepared by semi-continuous emulsifier-free emulsion polymerization technique. The morphology of the emulsion particles and the treated paper were characterized by transmission electron microscopy and scanning electron microscopy.The result indicated that the Zeta potential of the emulsion has maximum and the dispersion system would be more stable when the dosage of DMC was 1.5% on the whole monomers. When the amount of GTMAC was 1.5%, the increase of dry strength was 24.7% and folding endurance was 36 times.When the amount of HPMA was 1.5%~2.0% on the whole monomers, the paper possessed higher dry tensile strength and folding endurance.