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Liquefaction of waste pine wood and its application in the synthesis of a flame retardant polyurethane foam

机译：废松木的液化及其在阻燃聚氨酯泡沫塑料合成中的应用

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The utilization of sustainable forestry waste resources in the production of polyurethane (PU) foam is a promising green alternative to the use of un-sustainable resources. In this work, we report the liquefaction of waste pine wood at different reaction temperatures and its application in synthesizing a melamine phosphate modified wood type polyurethane foam (designated as MWPU). Our strategy was to obtain liquefied pine-based polyol at an optimum reaction temperature and apply the polyol in synthesizing a flame retardant (MWPU) foam via the incorporation of a melamine phosphate (MP) filler. Spectroscopic and microscopic analyses were conducted to investigate the structure characteristics and the morphology of the liquefied waste pine wood polyol and the synthesized (MWPU) foam. An optimum liquefaction temperature of 160 °C was obtained and the glass transition temperature (Tg) for 10 wt% incorporated MP foam was 43.8 °C. The as-prepared (MWPU) foam showed higher glass transition temperature and storage modulus than pine wood based PU foam without MP. The MWPU foam withstood heating at 300 °C without significant degradation and also exhibited a higher thermal stability and limited oxygen index (LOI) value than pine wood based PU foam. These results provided an insight into the physical and structural properties of the as-prepared bio-based foam and paved the way toward preparing bio-based PU foam, which could further expand its potential applications.
机译：在聚氨酯泡沫生产中利用可持续林业废弃物资源是使用不可持续资源的有前途的绿色替代方案。在这项工作中，我们报告了废松木在不同反应温度下的液化及其在合成磷酸三聚氰胺改性的木类聚氨酯泡沫（称为MWPU）中的应用。我们的策略是在最佳反应温度下获得液化的松木基多元醇，并通过掺入三聚氰胺磷酸酯（MP）填料 将该多元醇用于合成阻燃剂（MWPU）泡沫。进行了光谱和显微镜分析，以研究液化废松木多元醇和合成（MWPU）泡沫的结构特征和形态。获得的最佳液化温度为160°C，掺入10 wt％的MP泡沫的玻璃化转变温度（ T g ）为43.8° C。所制备的（MWPU）泡沫比没有MP的松木基PU泡沫具有更高的玻璃化转变温度和储能模量。 MWPU泡沫在300°C的高温下经受住加热而没有明显降解，并且与松木基PU泡沫相比，还表现出更高的热稳定性和有限的氧指数（LOI）值。这些结果提供了对所制备的生物基泡沫的物理和结构性质的见解，并为制备生物基PU泡沫铺平了道路，这可以进一步扩大其潜在的应用范围。

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