ABSTRACT

Wollastonite is an abundant mineral containing silicon, calcium and oxygen that has been shown to improve the properties of wood-based panels. Camel thorn (Alhagi maurorum) is a weed growing across much of Central Asia, and has relatively few commercial uses. The effects of addition of nano-wollastonite (NW) and camel-thorn chips on fire resistance of medium-density fiberboard (MDF) were assessed. Addition of 5 or 10% NW to urea-formaldehyde resin produced significant improvements in times to onset of ignition and glowing, as well as duration of burning in the panels. NW acted as a non-combustible mineral insulating layer. DFT analysis suggested that bonds between NW and wood cell-wall polymers improved overall panel properties by better integrating fibers into the composite matrix. The increased thermal conductivity caused by addition of NW also improved resin curing. Addition of 5 or 10% camel thorn chips to the resin prior to pressing negatively impacted fire properties. The results illustrate the potential for improving fire properties in MDF properties using NW.

摘要

硅灰石是一种富含硅，钙和氧的矿物质，已被证明可以改善人造板的性能。骆驼刺（Alhagi maurorum）是在中亚大部分地区生长的杂草，商业用途相对较少。评估了添加纳米硅灰石（NW）和骆驼刺碎片对中密度纤维板（MDF）耐火性的影响。在脲醛树脂中添加5％或10％的NW可以显着改善起燃和发光的时间，以及面板燃烧的持续时间。NW充当不可燃的矿物绝缘层。DFT分析表明，通过将纤维更好地整合到复合基质中，NW和木质细胞壁聚合物之间的键合改善了整体面板性能。由于添加NW而导致的导热性的提高也改善了树脂的固化。在压制负面影响着火性能之前，在树脂中添加5％或10％的骆驼刺碎片。