Shen Zhenghui, Rajabi-Abhari Araz, Oh Kyudeok, Lee Sooyoung, Chen Jiachuan, He Ming, Lee Hak Lae
Program in Environmental Materials Science, Department of Agriculture, Forestry and Bioresources, College of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea.
Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea.
Polymers (Basel). 2021 Feb 14;13(4):568. doi: 10.3390/polym13040568.
Coated paper with a porous coating layer may have enhanced light-scattering ability and thus favorable optical properties. However, the increased porosity of such a coating layer is likely to decrease the strength of the coated paper, thereby adversely affecting the quality of the paper in the printing and converting processes. In this research, polymer-stabilized (PS) latex was prepared and used as a cobinder for the pigment coating of the paper. The PS latex particles were colloidally stabilized by a 3:1 mixture of starch and polyvinyl alcohol. The influence of the PS latex cobinder on the viscosity, sedimentation, and consolidation of coating colors was investigated. In addition, the effect of the cobinder on the properties of coating layers, namely, their porosity and surface, optical, and tensile properties, was examined. The results revealed that the PS latex cobinder formed microstructures in the coating colors and affected their viscosity. The addition of PS latex also led to enhanced interactions between coating color components, which affected the consolidation of the coating color, resulting in the formation of dried coating layers with greater porosity and improved optical properties (i.e., higher brightness and opacity) relative to coatings without the PS latex cobinder. Furthermore, the addition of PS latex improved the tensile strength of the coating layers, which was attributable to the small size and the polymeric protective shell of the cobinder particles. Thus, these results show that this PS latex cobinder has the potential to be used for the production of high-quality coated paper products.
具有多孔涂层的涂布纸可能具有增强的光散射能力，因此具有良好的光学性能。然而，这种涂层孔隙率的增加可能会降低涂布纸的强度，从而对印刷和加工过程中的纸张质量产生不利影响。在本研究中，制备了聚合物稳定（PS）胶乳，并将其用作纸张颜料涂层的共粘合剂。PS胶乳颗粒通过淀粉和聚乙烯醇的3:1混合物进行胶体稳定。研究了PS胶乳共粘合剂对涂料粘度、沉降和固结的影响。此外，还研究了共粘合剂对涂层性能的影响，即孔隙率、表面、光学和拉伸性能。结果表明，PS胶乳共粘合剂在涂料中形成微观结构并影响其粘度。添加PS胶乳还导致涂料组分之间的相互作用增强，这影响了涂料的固结，导致形成相对于没有PS胶乳共粘合剂的涂层具有更大孔隙率和改善光学性能（即更高的亮度和不透明度）的干燥涂层。此外，添加PS胶乳提高了涂层的拉伸强度，这归因于共粘合剂颗粒的小尺寸和聚合物保护壳。因此，这些结果表明，这种PS胶乳共粘合剂有潜力用于生产高质量的涂布纸产品。
