Introduction: Paper is the most important material of the printing industry and is being improved due to the increasing needs of industry. The most important process to improve the optical and physical properties of paper is the surface coating. Paper has a smoother and opaquer surface with surface coating. In addition, brightness, whiteness, and yellowness values are improved with surface coating. Ultraviolet (UV) light in sunlight causes changes in the structure of the paper and coating chemicals and accordingly causes yellowing. Para-amino benzoic acid (PABA), due to its chemical structure, is a UV-blocking agent used in sunscreen creams. Methods: The effect of PABA on paper gloss, yellowness, and lightfastness values was investigated by adding it into the surface coating formulation. For this purpose, coating formulations were prepared with cationic starch and 3%, 5%, and 7% PABA; coatings were applied to the paper according to laboratory condition standards. Coated papers were printed with an IGT-C1 lab-type offset printability device with magenta ink. The printed papers were then exposed to a light fastness test with Solarbox. The color, brightness, and yellowness values of all samples before and after lightfastness were measured with an X-Rite spectrophotometer. The gloss of coated and printed paper sample values was measured with a BYK-Gardner glossmeter. Results: The gloss values of paper to which PABA was added, increased; however, it was determined that these gloss values decreased after the lightfastness test. Conclusions: PABA-added cationic starch coatings are more affected by UV light than cationic starch coatings.

中文翻译：

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研究添加对氨基苯甲酸 (PABA) 的淀粉涂层化学品对纸张适印性的影响

简介： 纸张是印刷行业最重要的材料，并且随着行业需求的不断增加而不断改进。提高纸张光学和物理性能的最重要过程是表面涂层。纸张具有更光滑和不透明的表面，并带有表面涂层。此外，通过表面涂层改善了亮度、白度和黄度值。阳光中的紫外线 (UV) 会导致纸张和涂层化学品的结构发生变化，从而导致泛黄。由于其化学结构，对氨基苯甲酸 (PABA) 是一种用于防晒霜的紫外线阻断剂。方法：通过将 PABA 添加到表面涂层配方中，研究了 PABA 对纸张光泽度、黄度和耐光度值的影响。以此目的，涂料配方由阳离子淀粉和 3%、5% 和 7% 的 PABA 制成；根据实验室条件标准将涂料涂在纸上。涂布纸是用 IGT-C1 实验室型胶印适印装置用品红色墨水印刷的。然后用 Solarbox 对印刷纸进行耐光性测试。使用爱色丽分光光度计测量耐光前后所有样品的颜色、亮度和黄度值。涂布纸和印刷纸样品的光泽度值用 BYK-Gardner 光泽计测量。结果：添加了 PABA 的纸张光泽度值增加；然而，确定这些光泽值在耐光性测试后下降。结论：添加 PABA 的阳离子淀粉涂层比阳离子淀粉涂层更受紫外线的影响。