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Synthesis and application of cationic spherical polyelectrolyte brushes as retention and drainage aid in bleached eucalyptus kraft pulp

机译：阳离子球形聚电解质电刷在漂白桉木牛皮纸浆中的助留和助滤性能

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In the present study, a series of cationic spherical polyelectrolyte brushes (CSPB), consisting of a silica core and a shell of copolymer of acrylamide (AM) and [2-(methacryloyloxy)ethyl] trimethylammonium chloride (METAC), were synthesized. Then a dual-component system which was composed of CSPB and anionic polyacrylamide (APAM) was used to improve the retention and drainage properties of bleached eucalyptus kraft pulp and precipitated calcium carbonate (PCC). Comparative researches about retention and drainage properties between CSPB/APAM system and cationic starch/APAM system were undertaken as well. Results showed that further improvement in first-pass retention (FPR) of pulp, FPR of PCC and drainage time could be achieved by CSPB/APAM system. It was also found that increase of shear intensity led to a decrease in retention efficiency, while it had no significant influence on drainage time of pulp. However, due to the symmetrical or quasi-symmetrical spherical brush structure, CSPB still showed better retention efficiency than cationic starch under different turbulent conditions. Furthermore, the flocculation mechanism of the CSPB/APAM dual-component system was proposed in the paper. (C) 2015 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
机译：在本研究中，合成了一系列阳离子球形聚电解质刷（CSPB），该刷由二氧化硅核和丙烯酰胺（AM）与[2-（甲基丙烯酰氧基）乙基]三甲基氯化铵（METAC）的共聚物的壳构成。然后，由CSPB和阴离子聚丙烯酰胺（APAM）组成的双组份体系用于改善漂白的桉木牛皮纸浆和沉淀碳酸钙（PCC）的保留和排水性能。还进行了CSPB / APAM体系与阳离子淀粉/ APAM体系的保留和排水性能的比较研究。结果表明，CSPB / APAM系统可以进一步提高纸浆的首过保留率，PCC的FPR和排水时间。还发现剪切强度的增加导致保留效率的降低，而对纸浆的排水时间没有显着影响。然而，由于对称或准对称的球形刷结构，CSPB在不同的湍流条件下仍显示出比阳离子淀粉更好的保留效率。此外，本文还提出了CSPB / APAM双组分系统的絮凝机理。 （C）2015韩国工业和工程化学学会。由Elsevier B.V.发布。保留所有权利。

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