Preparation and Characterization of Lignin-Acrylamide Copolymer as a Paper Strength Additive
Preparation and Characterization of Lignin-Acrylamide Copolymer as a Paper Strength Additive
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DOI：
10.15376/biores.11.1.1765-1783
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发表时间：
2016-01
期刊：
影响因子：
1.5
通讯作者：
Shoujuan Wang;Y. Sun;F. Kong;Guihua Yang;P. Fatehi
中科院分区：
文献类型：
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作者：
Shoujuan Wang;Y. Sun;F. Kong;Guihua Yang;P. Fatehi
根据目前的技术，木质素要么在制浆回收循环中焚烧，要么在废水处理系统中浪费，导致其利用率不足。然而，木质素可以转化为增值产品。本文以过硫酸钾（K2S2O8）为引发剂，在水溶液中进行木质素（SL）与丙烯酰胺（AM）的共聚，制备了木质素-丙烯酰胺（SL-AM）水溶性共聚物作为干强添加剂。结果表明，最佳共聚条件为：AM/SL摩尔比为7.5，K2S2O8用量为3.0 wt.%（以木质素为基础），反应温度为90℃，反应时间为4 h，在pH为7、浓度为10 g/L的水中溶解度为100%，接枝率为398%，分子量为1.94×105 g/mol。采用元素分析、傅里叶红外光谱（FTIR）、1H核磁共振光谱（H-NMR）和热重分析（TGA）对制备的SL-AM共聚物进行了表征。在纸浆中添加1.0 wt.%的SL-AM共聚物，纸浆的拉伸强度、撕裂强度和破裂强度分别提高了23.1%、22.7%和15.2%，表明所制共聚物是一种有效的造纸强度添加剂。
With currently practiced technology, lignin is either incinerated in the recovery cycle of pulping or wasted in wastewater treatment systems, resulting in its underutilization. However, lignin can be converted to value-added products. In this work, the copolymerization of soda lignin (SL) and acrylamide (AM) was carried out using potassium persulphate (K2S2O8) as an initiator in an aqueous solution to prepare water-soluble lignin-acrylamide (SL-AM) copolymer as a dry strength additive. The results showed that the optimal copolymerization conditions were 7.5 AM/SL molar ratio, 3.0 wt.% (based on lignin) of K2S2O8, 90 °C, and 4 h of reaction time, which resulted in a SL-AM copolymer with 100% solubility at 10 g/L concentration at pH 7 in water, a grafting ratio of 398%, and a molecular weight of 1.94×105 g/mol. The prepared SL-AM copolymer was characterized by elemental analysis, Fourier transform infrared (FTIR) spectroscopy, 1H nuclear magnetic resonance (H-NMR) spectroscopy, and thermogravimetric analysis (TGA). By adding 1.0 wt.% of SL-AM copolymer to the pulp, the tensile, tear, and burst strengths were increased by 23.1%, 22.7%, and 15.2%, respectively, which implies that the resultant copolymer was an effective strength additive for papermaking.