Ungureanu Elena, Fortună Maria E, Țopa Denis C, Lobiuc Andrei, Ungureanu Ovidiu C, Jităreanu Doina C
Department of Plant Science, "Ion Ionescu de la Brad" University of Life Sciences Iasi, 3 Mihail Sadoveanu Alley, 700490 Iasi, Romania.
Inorganic Polymers Department, "Petru Poni" Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania.
Materials (Basel). 2023 Feb 25;16(5):1904. doi: 10.3390/ma16051904.
In the present work, the possibility of increasing the calcium carbonate (CaCO) content in sheets of paper to optimize their properties was investigated. A new class of polymeric additives for papermaking is proposed as well as a method for their use in paper sheet containing the CaCO precipitated addition. Calcium carbonate precipitated (PCC) and fibers cellulose were adjusted with a cationic polyacrylamide flocculating agent (polydiallyldimethylammonium chloride (plyDADMAC) or cationic polyacrylamide (cPAM)). PCC was obtained in the laboratory by a double-exchange reaction between calcium chloride (CaCl) and sodium carbonate (NaCO) suspension. After testing, the dosage of PCC was established at 35%. To improve the systems of additives studied, the materials obtained were characterized and their optical and mechanical properties were analysed. The PCC had a positive influence over all of the paper samples, but in the case of use of cPAM and polyDADMAC polymers the paper obtained had superior properties compared to the paper obtained without additives. Also, the samples obtained in the presence of cationic polyacrylamide exhibit superior properties to those obtained in the presence of polyDADMAC.
在本研究中，探讨了提高纸张中碳酸钙（CaCO₃）含量以优化其性能的可能性。提出了一类新型的造纸用聚合物添加剂以及它们在含有沉淀碳酸钙添加剂的纸张中的使用方法。用阳离子聚丙烯酰胺絮凝剂（聚二烯丙基二甲基氯化铵（plyDADMAC）或阳离子聚丙烯酰胺（cPAM））对沉淀碳酸钙（PCC）和纤维素纤维进行调节。在实验室中通过氯化钙（CaCl₂）和碳酸钠（Na₂CO₃）悬浮液之间的双交换反应获得PCC。经过测试，确定PCC的用量为35%。为了改进所研究的添加剂体系，对获得的材料进行了表征，并分析了它们的光学和机械性能。PCC对所有纸样都有积极影响，但在使用cPAM和聚DADMAC聚合物的情况下，所得纸张比未添加添加剂的纸张具有更优异的性能。此外，在阳离子聚丙烯酰胺存在下获得的样品比在聚DADMAC存在下获得的样品具有更优异的性能。
