【摘要】 以丙烯酰胺和二甲基二烯丙基氯化铵(DDAC)为主单体通过自由基共聚反应合成了水包水型阳离子聚丙烯酰胺(CPAA)乳液增强剂,并探讨了在漂白木浆中的应用条件如CPAA乳液用量、反应时间、硫酸铝用量、浆料pH值、搅拌速度对其增强效果的影响。结果表明,当CPAA乳液用量为0.8%(对绝干浆)、pH值7.0、反应时间10 m in、硫酸铝用量为0.5%(对绝干浆)、搅拌速度150 r/m in时,纸页裂断长和撕裂指数与未加助剂时相比依次增加28.7%和12.4%。红外光谱分析表明,合成的CPAA乳液具有预期设计结构。分析添加乳液前后纸页的环境扫描电镜照片对CPAA乳液的增强机理作了初步探讨。更多还原

【Abstract】 Water-in-water type cationic polyacrylamide(CPAA) emulsion was synthesized through free-radical copolymerization of acrylamide and dimethyl diallyammonium chloride(DDAC).The impacts of application conditions,such as dosage of CPAA(emulsion,) reaction time,amount of aluminum sulfate,pH value of wood pulp and stirring speed on its reinforcing effect toward bleached wood-pulp were explored.As a result,compared to paper characteristics without CPAA emulsion,breaking length and tearing index of paper sheets of wood pulp were increased respectively by 28.7% and 12.4% at charge of CPAA emulsion 0.8 %(on oven dry pulp),reaction time 10 min,pH value 7.0,dosage of aluminum sulfate 0.5 %(on oven dry pulp) and stirring speed 150 r/min.The expected molecular structure of CPAA made in our lab was identified from its infrared spectrum.Its(reinforcing) mechanism toward bleached wood pulp was also explored elementarily by comparing photographs from environmental scanning(electron) microscopy(ESEM) between paper sheets with and without CPAA emulsion treatments.更多还原