近年来,研究人员对造纸领域新型湿强剂的改进和升级给予了极大的关注,特别是在使用家用纸张方面。在这里,通过聚乙烯亚胺(PEI)和γ-缩水甘油醚丙基三甲氧基硅烷(KH560)合成PEIM-KH560,PEI的分子量(Mw)为600、1800、10,000、70,000和750,000。结果表明,分子量对PEI-KH560的尺寸和热稳定性等理化性质有很大影响。PEI-KH560的固有阳离子电荷提供了与纸纤维的结合位点,形成强化的纤维-纤维接头。结果表明,干燥,纤维素纸页的湿强度和疏水性明显提高。当m(PEI):m(KH560)为1:2时,用600和1800的PEI的Mw施胶后的纸张强度最为明显,干强度分别提高227.9%和187.5%,湿强度分别提高了183.8%和207.8%,分别。在PEI1800-KH560处发现最大疏水性,接触角值为130.6°。在这项工作中获得的所得环境友好剂(PEI-KH560)为家用和食品包装纸的制备提供了有价值的意义。
In recent years, researchers have put much attention on the improvements and upgrades of novel wet strength agent in the papermaking fields, especially in the usage of household paper. Herein, PEIM-KH560 by polyethyleneimine (PEI) and γ-glycidyl ether propyl trimethoxysilane (KH560) was synthesized with five molecular weights (Mw) of PEI at 600, 1800, 10,000, 70,000 and 750,000. Results showed that the molecular weight greatly influenced the physicochemical properties of PEI-KH560, such as the size and thermal stability. The intrinsic cationic charge of PEI-KH560 provided the bonding sites with the paper fibers, forming strengthened fiber-fiber joints. It was shown that the dry, wet strength and
hydrophobicity of cellulosic paper sheets were obviously improved. When the m (PEI):m(KH560) is 1:2, the strength of papers after sizing by Mw of PEI at 600 and 1800 is the most obvious, with the dry strength increased by 227.9 % and 187.5 %, and the wet strength increased by 183.8 % and 207.8 %, respectively. The maximum
hydrophobicity was found at the PEI1800-KH560 with the contact angle value of 130.6°. The resultant environmental-friendly agent (PEI-KH560) obtained in this work provides valuable significance for the preparation of household and food packaging paper.