Latent heat absorption of alkali metal hydrates enables delayed ignition and improved flame retardancy of epoxy resin

IF 3.1 2区化学 Q2 CHEMISTRY, ANALYTICAL

Thermochimica Acta Pub Date : 2024-07-25 DOI:10.1016/j.tca.2024.179830

引用次数: 0

Abstract

In this work, alkali metal hydrates, barium hydroxide octahydrate (BHO) and sodium acetate trihydrate (SAT) were added into epoxy resin (EP) to prepare a series of flame-retardant EP composites. It showed that EP samples can pass the V-0 rating of UL-94 when the amount of hydrated salt exceeds 45 wt%. When the additional amount of SAT is 50 wt%, the LOI of the EP sample increases to as high as 39% compared to 19% of pure EP. In addition, the time to ignition (TTI) of EP with 50 wt% SAT was prolonged to 157 s from 63 s of pure EP, which can provide valuable time for fire escape. The peak heat release rate (PHRR) was reduced by 63.9% compared with that of pure EP (from 1392.4 kW/m² to 502.18 kW/m²), which indicated that phase change heat absorption plays a crucial role in reducing fire hazards of EP.

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碱金属水合物的潜热吸收可使环氧树脂延迟点火并提高阻燃性能

本研究在环氧树脂（EP）中加入碱金属水合物、八水氢氧化钡（BHO）和三水醋酸钠（SAT），制备了一系列阻燃 EP 复合材料。结果表明，当水合盐的用量超过 45 wt% 时，EP 样品可以通过 UL-94 的 V-0 级认证。当 SAT 的添加量为 50 wt% 时，EP 样品的 LOI 与纯 EP 的 19% 相比，增加到高达 39%。此外，添加 50 wt% SAT 的 EP 的着火时间（TTI）从纯 EP 的 63 秒延长到了 157 秒，这为火场逃生提供了宝贵的时间。与纯 EP 相比，峰值放热率（PHRR）降低了 63.9%（从 1392.4 kW/m2 降至 502.18 kW/m2），这表明相变吸热在降低 EP 的火灾危害方面发挥了重要作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thermochimica Acta 化学-分析化学

CiteScore

6.50

自引率

8.60%

发文量

210

审稿时长

40 days

期刊介绍： Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes