【作者】 秦丽娟；

【导师】 陈夫山； 王立军；

【作者基本信息】 天津科技大学 ， 制浆造纸工程， 2005， 硕士

【摘要】 本论文为了探索高取代度阳离子淀粉(HCS)和高取代度阳离子瓜尔胶(HCG)作为废纸浆胶粘物控制剂的可行性,首先采用半干法合成了高取代度阳离子淀粉(HCS)和高取代度阳离子瓜尔胶(HCG),通过详细考察醚化剂用量、碱用量、体系含水量、促进剂、反应温度以及反应时间等因素对反应的影响,在优化了半干法制备HCS和HCG的工艺条件下,制备出取代度大于0.9的高取代度阳离子淀粉和取代度大于0.24的高取代度阳离子瓜尔胶。采用红外光谱技术手段,对所制备的物质进行结构表征。 在探索控制胶粘物效果的研究中,将取代度为0.94的HCS和取代度为0.30的HCG作为单元系统与聚胺(PA)进行了比较;在此基础上又考察了由PA与HCS或HCG组成的二元系统,以及由PA、HCS或HCG、阳离子聚丙烯酰胺助留剂(CPAM))组成的三元系统控制废纸浆胶粘物的效果,以及它们对浆料单程留着率和纸张物理性质引起的影响。 研究结果表明,单元系统对胶粘物的控制效果不太理想,二元系统对胶粘物的控制效果明显好于使用单元控制系统的效果,三元系统的效果比较优秀。当加入1000ppm PA、500ppm HCS或HCG时,胶粘物去除率可以分别达到74.30%和84.51%;当加入1000ppm PA、500ppmHCS或HCG以及500ppmCPAM时,胶粘物去除率分别可以达到80.28%和92.60%;使用二元、三元控制系统可以提高浆料的单程留着率,改善纸张的紧度,对纸张的强度影响不大。更多还原

【Abstract】 In order to investigate the feasibility of using high substituted cationic starch (HCS) and high substituted cationic guar gum (HCG) in controlling stickies problems in waste pulps, a series of HCS and HCG were synthesized by half-dry process. The effects of factors such as the dosage of etherifying agent, the dosage of alkali, water content of the system, reaction temperature and reaction time were studied. Under the optimum process conditions, cationic starches with degree of substitution (DS) above 0.9 and cationic guar gums with DS above 0.24 were prepared, and their structures characterized by Fourier transform infrared spectroscopy (FTIR).In studying the effects of stickies controlling, single systems using HCS (DS 0.94) and HCG (DS 0.30) were compared with polyamine (PA);then the effects of dual systems with the combination of PA and HCS or HCG, triple systems with the combination of PA, HCS or HCG, and a cationic polyacrylamide(CPAM) retention agent in stickies controlling were also studied, together with their effects on pulp overall retention and handsheets physical properties.The results showed that single systems were not good enough, dual systems were much better and triple systems were excellent in stickies control. In the dual systems, when the dosage of PA was 1000ppm and the dosage of HCS or HCG 500ppm, the stickies removal ratios were 74.30% and 84.51%. In the triple systems, when the dosage of PA was 1000ppm, the dosage of HCS or HCG 500ppm and the dosage of CPAM 500ppm, the removal ratios were 80.28% and 92.60%. It also showed that the overall retentions of pulp were improved, the densities of handsheets increased while paper strengthes changed only slightly.更多还原