Coal to Hydrogen Energy for Sustainable Solutions (CHESS) Division, CSIR - Central Institute of Mining and Fuel Research (CIMFR), Digwadih Campus, PO: FRI, Dhanbad, Jharkhand, 828108, India.
Center for Incubation Innovation Research and Consultancy, Jyothy Institute of Technology Campus, Thataguni Post, Bengaluru, 560082, India.
Environ Geochem Health. 2023 Oct;45(10):6955-6965. doi: 10.1007/s10653-023-01489-9. Epub 2023 Feb 1.
Additives provide substantial improvement in the properties of composites. Although bio-based composites are preferred over synthetic polymer and metal-based composites, they do not have the requisite properties to meet specific needs. Hence, organic, inorganic and metallic additives are included to improve the properties of bio-based composites. Coal is a readily available resource with high thermal insulation, flame resistance and other properties. This work demonstrates the addition of 20-30% natural sub-bituminous coal as filler for coir-reinforced polypropylene (PP) composites and exhibits an increased tensile strength by 66% and flexural strength by 55% compared to the composites without any filler. Such composites are intended for insulation applications and as a replacement for gypsum-based false ceiling tiles. Various ratios of coal samples were included in the composites and their effect on mechanical, acoustic, thermal insulation, flame and water resistance have been determined. A substantial improvement in both flexural and tensile properties has been observed due to the addition of coal. However, a marginal improvement has been observed in both thermal conductivity (0.65 W/mK) and flame resistance values due to the presence of coal. Adding coal increases the intensity of noise absorption, particularly at a higher frequency, whereas water sorption of the composites tends to decrease with an increase in the coal content. The addition of coal improves and adds unique properties to composites, allowing coir-coal-PP composites to outperform commercially available gypsum-based insulation panels.
添加剂可显著改善复合材料的性能。虽然生物基复合材料优于合成聚合物和金属基复合材料，但它们不具备满足特定需求的必要性能。因此，有机、无机和金属添加剂被加入到生物基复合材料中，以改善其性能。煤炭是一种来源丰富的资源，具有高热绝缘性、耐燃性和其他性能。本工作证明，将 20-30%的天然次烟煤作为填充料加入到椰壳纤维增强聚丙烯（PP）复合材料中，与不含任何填充料的复合材料相比，其拉伸强度提高了 66%，弯曲强度提高了 55%。此类复合材料旨在用于隔热应用，并作为石膏基假天花板瓷砖的替代品。在复合材料中加入了不同比例的煤样，并确定了它们对机械性能、声学性能、热绝缘性能、耐燃性能和耐水性能的影响。由于添加了煤，复合材料的弯曲和拉伸性能都有了显著提高。然而，由于煤的存在，复合材料的导热系数（0.65 W/mK）和耐燃性值仅略有提高。添加煤会增加噪声吸收的强度，特别是在较高频率下，而复合材料的吸水率随着煤含量的增加而降低。添加煤可改善复合材料的性能并赋予其独特的性能，使椰壳-煤-PP 复合材料的性能优于市售的石膏基隔热板。
