Talc is a popular filler for the fabrication of plastic composites. The presence of talc helps improve mechanical, thermal, and flame resistance properties of the composite. In this work, we report the influence of a talc-filled plastic shell layer on thermal stability and fire flammability of the core-shell structured wood high-density polyethylene (HDPE) composites manufactured through coextrusion. The result showed that morphological analysis of the char layer after combustion confirmed the formation of a continuous surface char layer with talc addition in the composites, helping block fire penetration and enhance overall fire resistance of the composites. The shell thickness averaged at , which represents a fair thick shell over a 10 mm thick WPC core layer. The surface of regular wood-filled HDPE showed large cracks, allowing more rapid fire penetration and reducing its fire resistance. At 800°C, average residual weight for all composite was , most of which was attributed to the inorganic nonvolatile talc components. With the increase of talc level, THR values of coextruded WPC decreased from 302.47 MJ/m² (5 wt% of talc) to 262.96 kW/m² (50 wt% of talc). When talc content in the shell layer was less than 25 wt%, the flame resistance properties were slightly enhanced compared with the composites containing unmodified HDPE shells. When talc content in the shell exceeded 25 wt%, the composite’s total heat release and its rate substantially decreased.

中文翻译：

---

滑石填充塑料壳共挤木塑复合材料的热稳定性和阻燃性

滑石粉是用于制造塑料复合材料的流行填料。滑石粉的存在有助于改善复合材料的机械，耐热和阻燃性能。在这项工作中，我们报告了滑石粉填充的塑料壳层对通过共挤出生产的核壳结构木质高密度聚乙烯（HDPE）复合材料的热稳定性和可燃性的影响。结果表明，燃烧后炭层的形态分析证实在复合物中形成了滑石粉，形成了连续的表面炭层，有助于阻止火的渗透并增强复合物的整体耐火性。外壳厚度平均为，代表10毫米厚WPC核心层上的相当厚的外壳。普通的木质填充HDPE的表面显示出大的裂缝，从而使火灾更加迅速地渗透并降低了其耐火性。在800°C下，所有复合材料的平均残余重量为，其中大部分归因于无机非挥发性滑石成分。随着滑石含量的增加，共挤出WPC的THR值从302.47 MJ / m ²（滑石的5 wt％）降低到262.96 kW / m ²（滑石的50 wt％）。当壳层中的滑石含量小于25wt％时，与包含未改性的HDPE壳的复合材料相比，阻燃性能稍微增强。当壳中的滑石含量超过25wt％时，复合材料的总热量释放和速率大大降低。