Paper-based abrasive products are multilayer structures in which the first layer on the paper substrate is usually a latex barrier coating to prevent the migration of adhesive glue into the substrate. The high coat weight (10 g/m2) of latex barrier layers is a cause of environmental concerns. Hence, alternative materials that can provide the barrier function at lower coat weights are desired. In this work, microfibrillated cellulose (MFC) combined with poly(vinyl) alcohol (PVA) were explored as suitable alternatives to the current latex coatings. Barrier coating formulations containing PVA, MFC, and silica (SiO2) were developed and applied to a paper substrate using a rod coating method on a pilot scale. Coating quality and barrier performance were characterized using scanning electron microscope images, air permeance, surface roughness, water contact angle, KIT test, and oil Cobb measurements. The barrier coatings were also studied for adhesion to the subsequent coating layer. An optimal barrier function was achieved with the developed coatings at a low coat weight of ca. 3 g/m2. The adhesion of pure PVA and PVA-MFC barrier coatings to the subsequent coating layer was inadequate; however, silica addition was found to improve the adhesion.
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机译：基于纸的磨料产品是多层结构，其中纸基材上的第一层通常是胶乳屏障涂层，以防止粘合剂胶迁移到基材中。高涂层重量（10g / m 2）的乳胶屏障层是环境问题的原因。因此，需要在较低涂层重量处提供障碍物的替代材料。在这项工作中，将微纤化纤维素（MFC）与聚（乙烯基）醇（PVA）联合为当前胶乳涂层的合适替代品。含有PVA，MFC和二氧化硅（SiO 2）的阻挡涂层制剂并在先导尺度上使用棒涂法施加到纸基材上。使用扫描电子显微镜图像，空气渗透，表面粗糙度，水接触角，试剂盒试验和油COBB测量来表征涂层质量和屏障性能。还研究了阻挡涂层，用于粘附到随后的涂层。通过在CA的低涂层重量的涂层中实现了最佳阻挡功能。 3 g / m2。纯PVA和PVA-MFC阻挡涂层与后续涂层的粘附性不足;然而，发现二氧化硅添加改善粘附性。
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