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Comparative study of the impact of additives against oxygen inhibition additives pendulum hardness and abrasion resistance for UV-curable wood finishes
Progress in Organic Coatings ( IF 6.6 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.porgcoat.2020.105879
Aurélien Hermann , Dominique Burr , Véronic Landry

Abstract The multiple advantages of UV-curable coatings, such as high curing speeds and cross-linking densities, low VOC and energy consumption led to a widespread interest for a wide range of applications. Free-radical photopolymerization constitutes one of the most used methods of polymerization. However, oxygen present in the atmosphere is able to inhibit radical formation and propagation, which is considered a major drawback. Among all the strategies developed for reducing the oxygen inhibition, the addition of reactive additives is often preferred. This method does not require major changes in the production lines of the industries or in the formulations compositions. The efficiency of reactive additives against oxygen inhibition has been investigated in multiple studies, but in different experimental conditions. The addition of the reactive additives can also influence coatings hardness and abrasion resistance which are considered important mechanical properties. The aim of this study is to evaluate additives overall performances. Eleven of the chosen additives were previously described in the literature. The four remaining are commercial products never used for that application, like a polyhedral oligomeric silsesquioxane bearing a thiol function, which later showed the best results. Reduction of oxygen inhibition was analyzed by photo differential scanning calorimetry (Photo-DSC) and Confocal Raman Micro-spectroscopy (CRM). Pendulum hardness and abrasion resistance measurements were used to determine the influence of the additives on the mechanical properties of the coatings. The results obtained show that most of the additives tested had reducing effect on the pendulum hardness, but helped in improving the abrasion resistance.

中文翻译:

添加剂对紫外光固化木饰面抗氧添加剂摆硬度和耐磨性影响的比较研究

摘要 紫外光固化涂料具有固化速度快、交联密度高、挥发性有机化合物低和能耗低等多重优势,在广泛的应用领域受到广泛关注。自由基光聚合是最常用的聚合方法之一。然而,大气中存在的氧气能够抑制自由基的形成和传播,这被认为是一个主要缺点。在为减少氧抑制而开发的所有策略中,通常优选添加反应性添加剂。这种方法不需要对工业生产线或配方成分进行重大改变。已在多项研究中研究了活性添加剂对氧抑制的效率,但在不同的实验条件下。反应性添加剂的添加也会影响涂层硬度和耐磨性,这些被认为是重要的机械性能。本研究的目的是评估添加剂的整体性能。之前在文献中描述了 11 种所选添加剂。剩下的四种是从未用于该应用的商业产品,如带有硫醇官能团的多面体低聚倍半硅氧烷,后来显示出最好的结果。通过光差示扫描量热法 (Photo-DSC) 和共焦拉曼显微光谱法 (CRM) 分析氧抑制的减少。摆式硬度和耐磨性测量用于确定添加剂对涂层机械性能的影响。
更新日期:2020-11-01
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