Taghiyari Hamid R, Antov Petar, Soltani Abolfazl, Ilies Dorina Camelia, Nadali Elham, Lee Seng Hua, Grama Vasile, Simona Tripa
Wood Science and Technology Department, Faculty of Materials Engineering &Interdisciplinary Sciences, Shahid Rajaee Teacher Training University (SRTTU), Tehran, 16788-15811, Iran.
Department of Mechanical Wood Technology, Faculty of Forest Industry, University of Forestry, 1797, Sofia, Bulgaria.
Sci Rep. 2024 Feb 20;14(1):4168. doi: 10.1038/s41598-024-54451-9.
Sepiolite is a silicate mineral that improves the fire properties in solid wood when mixed with a water-based coating. The present study was carried out to investigate and evaluate the effects of sepiolite addition to acrylic-latex paint on the pull-off adhesion strength, as an important characteristic of paints and finishes used in the modern furniture industry and historical furniture as well for preservation and restoration of heritage objects. Sepiolite was added at the rate of 10%, and brushed onto plain-sawn beech (Fagus orientalis L.) wood specimens, unimpregnated and impregnated with a 400 ppm silver nano-suspension, which were further thermally modified at 185 °C for 4 h. The results showed that thermal modification had a decreasing effect on the pull-off adhesion strength, primarily as a result of the thermal degradation of cell-wall polymers (mostly hemicelluloses). Still, a decreased wettability as a result of condensation and plasticization of lignin was also partially influential. Based on the obtained results,thermal modification was found to have a significant influence on pull-off adhesion strength. Sepiolite addition had a decreasing effectin all treatments, though the effect was not statistically significant in all treatments. The maximum and minimum decreases due to sepiolite addition were observed in the unimpregnated control (21%) and the thermally-modified NS-impregnated (4%) specimens. Other aspects of the sepiolite addition, and further studies that cover different types of paints and coatings, should be evaluated before coming to a final firm conclusion in this regard.
海泡石是一种硅酸盐矿物，与水性涂料混合时可改善实木的防火性能。本研究旨在调查和评估向丙烯酸乳胶漆中添加海泡石对拉拔附着力强度的影响，拉拔附着力强度是现代家具行业和历史家具以及文物保护与修复中使用的油漆和饰面的一个重要特性。以10%的比例添加海泡石，并涂刷在未浸渍和浸渍了400 ppm银纳米悬浮液的径切山毛榉（Fagus orientalis L.）木材试件上，这些试件在185℃下进一步热改性4小时。结果表明，热改性对拉拔附着力强度有降低作用，主要是由于细胞壁聚合物（主要是半纤维素）的热降解。不过，木质素的缩合和增塑导致的润湿性降低也有一定影响。基于所得结果，发现热改性对拉拔附着力强度有显著影响。添加海泡石在所有处理中都有降低作用，尽管在所有处理中该作用在统计学上并不显著。在未浸渍对照（21%）和热改性纳米银浸渍（4%）试件中观察到添加海泡石导致的最大和最小降幅。在就此得出最终确切结论之前，应评估添加海泡石的其他方面以及涵盖不同类型油漆和涂料的进一步研究。
