UV-curable coatings are attractive for a wide range of applications due to several advantages, including rapid polymerization rates, increased production rate, and low environmental impact (from limited use of volatile organic compounds). In the present work, UV-curable formulations were prepared from various acrylate oligomers and monomers and modified silica as a matting agent. To improve compatibility between the acrylate-based coating and silica, the surface of the silica particles was modified in two steps. First, to introduce amino-reactive groups to the surface, (3-aminopropyl) triethoxysilane (APTES) was grafted onto the silica. Subsequently, the second step consisted of grafting an acrylate monomer, dipropylene glycol diacrylate (DPGDA), via the aza-Michael reaction. The functionalization with acrylate chains promotes compatibility with the acrylate-based coating formulation and results in a very low gloss surface. The modified silica was characterized through a variety of techniques, including thermogravimetric analysis (TGA), ²⁹Si and ¹³C NMR and laser diffraction particle size analysis. The matte UV-curable coatings were characterized using viscometry, photo-DSC (kinetic analysis) and real-time FTIR (conversion rate determination), gloss measurements, profilometry (surface roughness analysis), as well as scratch testing (abrasion resistance). This silica modification allows the formation of coatings with low gloss levels at loadings as low as 10% wt modified silica.

紫外线固化涂料具有多种优势，包括快速聚合速率、更高的生产率和对环境的影响低（由于挥发性有机化合物的使用有限），因此在广泛的应用中具有吸引力。在目前的工作中，UV 固化配方是由各种丙烯酸酯低聚物和单体以及作为消光剂的改性二氧化硅制备的。为了提高丙烯酸酯基涂料和二氧化硅之间的相容性，分两步对二氧化硅颗粒的表面进行改性。首先，为了将氨基反应性基团引入表面，将（3-氨基丙基）三乙氧基硅烷（APTES）接枝到二氧化硅上。随后，第二步包括通过 aza-Michael 反应接枝丙烯酸酯单体、二丙二醇二丙烯酸酯 (DPGDA)。丙烯酸酯链的官能化促进了与丙烯酸酯基涂料配方的相容性，并导致表面光泽度非常低。改性二氧化硅通过多种技术进行表征，包括热重分析 (TGA)、²⁹ Si 和¹³ C NMR 和激光衍射粒度分析。哑光 UV 固化涂料使用粘度测定法、photo-DSC（动力学分析）和实时 FTIR（转化率测定）、光泽度测量、轮廓测定（表面粗糙度分析）以及划痕测试（耐磨性）进行表征。这种二氧化硅改性允许在低至 10% wt 改性二氧化硅的负载下形成具有低光泽度的涂层。