Nano-layered double hydroxides as efficient endothermic, strengthening, and flame-retardant agents for fly ash/polyurethane composite materials

IF 6.5 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications Pub Date : 2024-11-16 DOI:10.1016/j.coco.2024.102168

Sitong Zhang , Rui Feng , Jing Zhang , Wenwen Yu , Lan Jia , Fengbo Zhu , Qiang Zheng

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引用次数: 0

Abstract

Polyurethane (PU) grouting materials in coal mining must possess essential mechanical properties and exhibit low heat release and high flame retardancy to enhance the safety and efficiency of coal mining. In this study, fly ash (FA) and nano-layered double hydroxides (LDH) were utilized as fillers to prepare a series of PU/FA/LDH composite grouting materials. Results showed that incorporating 2.5 % LDH reduced the maximum reaction temperature by 26.7 °C and decreased heat release from 177.45 J/g to 108.37 J/g compared to PU grouting material. These reductions were attributed to the uniform dispersion of LDH, which enabled the endothermic removal of plentiful adsorbed water during the curing process. However, exceeding 2.5 % LDH caused agglomeration, encapsulating the water and increasing the maximum reaction temperature. The effective fraction of closed cells in the PU/FA/LDH composite grouting materials was tailored by increasing the content of LDH, leading to enhanced compression strength. Moreover, cone calorimetry revealed that LDH was more effective in reducing the heat release during the combustion process of PU grouting materials, while FA was more effective in reducing smoke production. This synergistically enhanced the flame retardancy of the PU grouting materials. This work provides an effective way to produce high-strength, flame-retardant grouting materials at lowered reaction temperatures.

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纳米层状双氢氧化物作为粉煤灰/聚氨酯复合材料的高效吸热剂、强化剂和阻燃剂

煤矿用聚氨酯（PU）灌浆材料必须具备基本的机械性能、低放热性和高阻燃性，以提高煤矿开采的安全性和效率。本研究利用粉煤灰（FA）和纳米层状双氢氧化物（LDH）作为填料，制备了一系列聚氨酯/FA/LDH 复合灌浆材料。结果表明，与聚氨酯灌浆材料相比，加入 2.5 % 的 LDH 可使最高反应温度降低 26.7 °C，放热量从 177.45 焦耳/克降至 108.37 焦耳/克。这些降低归功于 LDH 的均匀分散，这使得在固化过程中大量吸附水的内热去除成为可能。然而，超过 2.5 % 的 LDH 会导致结块，将水包裹起来，并提高最高反应温度。通过增加 LDH 的含量，聚氨酯/FA/LDH 复合灌浆材料中封闭孔的有效比例得到了调整，从而提高了抗压强度。此外，锥形量热仪显示，LDH 能更有效地减少聚氨酯灌浆材料燃烧过程中的热量释放，而 FA 则能更有效地减少烟雾产生。这种协同作用增强了聚氨酯灌浆材料的阻燃性。这项研究为在较低的反应温度下生产高强度阻燃灌浆材料提供了有效途径。

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来源期刊

Composites Communications Materials Science-Ceramics and Composites

CiteScore

12.10

自引率

10.00%

发文量

340

审稿时长

36 days

期刊介绍： Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.