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Study of the Adhesion of Silicate-Based Coating Formulations on a Wood Substrate

机译：基于硅酸盐的涂料配方对木材基材的粘附性研究

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Silicate coatings are environmentally friendly inorganic-based products that have long been used for mineral substrates and protection of steel against corrosion. The development and acceptance of these coatings in the wood sector require some adjustments in formulations or special preparation of the surface to be coated to obtain durable finishes. In this work, the adhesion of various silicate-based formulations to a beech wood substrate (Fagus sylvatica L.), was assessed with the main objective to study relevant parameters and potential improvements. Adhesion strength was determined by pull-off and cross-cut tests. Other coating properties such as scratch, impact, and water resistance were also determined. Surface roughness and interface were analyzed using confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM), and coating curing was studied by attenuated total reflection-infrared spectroscopy (ATR FTIR). The results showed that adhesion was highly dependent on formulation, penetration of the coatings into wood, and mechanical anchoring. Increasing the content of solid particles in the coating formulations or adding a polyol (glycerol, xylose), which probably acted as a coalescent, considerably decreased the adhesion strength, probably by blocking penetration into the wood by forming aggregates. Adhesion was improved by pre-mineralization of the surface, and substitution of a part of the potassium silicate binder with potassium methyl siliconate reduced the formation of cracks caused by dimensional instability of the wood.
机译：硅酸盐涂层是环保的无机基产品，长期以来一直用于矿物质基材和防止腐蚀的保护。这些涂料在木材部门的开发和接受需要在待涂覆的表面的配方或特殊制剂中进行一些调整，以获得耐用的饰面。在这项工作中，评估了各种硅酸盐基配方对山毛榉木基材（Fagus Sylvatica L）的粘附，主要目的是研究相关参数和潜在改进。通过拉出和交叉测试测定粘合强度。还确定了其他涂层性质，如划痕，撞击和耐水性。使用共聚焦激光扫描显微镜（CLSM）和扫描电子显微镜（SEM）分析表面粗糙度和界面，并通过减弱的总反射红外光谱（ATR FTIR）研究涂层固化。结果表明，粘合性高度依赖于配方，涂层渗透到木材中，并机械锚固。增加涂料制剂中固体颗粒的含量或加入多元醇（甘油，木糖），其可能用作聚结，显着降低粘合强度，可能通过形成聚集体来阻挡进入木材的渗透。通过表面的预矿化改善了粘合性，并且将硅酸钾粘合剂的一部分用甲基硅酸钾取代了由木材的尺寸不稳定性引起的裂缝的形成。

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