羟丙酯改性阳离子醚化聚乙烯醇增干强剂的合成

以甲基丙烯酸羟丙酯(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,无皂乳液聚合法合成乳液增干强剂。通过FTIR及TEM对聚合物的结构及乳液粒子形态进行表征,探讨阳离子醚化剂的添加对乳液颗粒粒径的影响;去离子水的用量对乳液黏度的影响;引发剂的种类和用量对单体转化率的影响;及乳液添加量对纸张各项物理性能的影响。结果表明,加入阳离子醚化剂可使乳液粒径显著减小;水的质量分数为83.5%～84%时乳液的黏度较适宜;引发剂的用量达到0.3%,单体转化率最高;乳液添加量为1.2%,干抗张强度明显提高,其增加幅度为17.3%。

Synthesis of HPMA Modified and Cationic Etherified PVA as Dry Strength Additive

The dry strength additive was prepared by the emulsifier-free polymerization with hydroxy propyl methacrylate(HPMA) as functional monomer,methacroylcholine chloride(DMC) as cationic-functional monomer,and glycidyl-trimethylammonium chloride(GTMAC) as cationic etherifying agent.The physical properties and particle structure of the copolymer were investigated by FTIR and TEM.At the same time,the influence of the cationic etherifying agent to latex particle size,the capacity of demonized water to emulsion viscosity,the specie and capacity of initiator to monomer conversion and different dosage on dry strength additive to physical properties of paper were discussed.The experiment result showed that cationic etherifying agent made emulsion sizes reduce obviously.When the content of demonized water was 83.5% to 84%,the emulsion viscosity was suitable.To obtain the highest monomer conversion,the dosage of initiator was 0.3%.When the charge of emulsion was 1.2%,the dry tensile strength was enhanced to as much as 17.26%.