Abstract With the rapid development of Al electrolytic capacitors, plenty of industrial effluents are generated during the corrosion process of aluminium anode, resulting in serious environmental problems. To address such a challenging but urgent issue, we recycle powders containing lots of flame-retardant compositions from the precipitate of industrial effluents and apply them in the intumescent fire retardant coating. The formula of coating is optimized using response surface methodology based on central composite design. Under the optimum formula (APP: 60 wt%, PER: 19 wt%, MEL: 18 wt%, and the recycled powder: 9 wt%), the optimal sample is prepared and its fire resistance is investigated in our lab. During the fire resistance test, this sample displays the lowest backside temperature (only 163 °C) among all samples, indicating superior fire retardancy. In addition to fire resistance analysis, the water resistance and thermal stability of intumescent fire retardant coatings are also characterized. Our results show that the water contact angle and char yield of optimal sample reach up to 78.9° and 30.1 %, respectively. Thus, the optimal coating features superior fire retardancy, excellent water resistance and outstanding thermal stability. This work offers a practical strategy for creating a high-performance intumescent fire retardant coating based on the reuse of industrial effluent, which is favorable to environment protection and has a promising future in the industry.

中文翻译：

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使用响应面法优化工业废水回收粉末膨胀型防火涂料

摘要 随着铝电解电容器的快速发展，铝阳极腐蚀过程中产生大量工业废水，造成严重的环境问题。为了解决这样一个具有挑战性但紧迫的问题，我们从工业废水的沉淀物中回收含有大量阻燃组合物的粉末，并将它们应用于膨胀型防火涂料。采用基于中心复合设计的响应面法优化涂层配方。在最佳配方（APP：60 wt%，PER：19 wt%，MEL：18 wt%，再生粉：9 wt%）下，制备了最佳样品，并在我们的实验室研究了其耐火性。在耐火性测试中，该样品在所有样品中显示出最低的背面温度（仅 163 °C），表明具有优越的阻燃性。除了耐火性分析，膨胀型防火涂料的耐水性和热稳定性也被表征。我们的结果表明，最佳样品的水接触角和炭化率分别达到 78.9°和 30.1%。因此，最佳涂层具有优异的阻燃性、优异的耐水性和出色的热稳定性。该工作为基于工业废水回用制备高性能膨胀型防火涂料提供了一种实用策略，该涂料有利于环境保护，在行业中具有广阔的前景。我们的结果表明，最佳样品的水接触角和炭化率分别达到 78.9°和 30.1%。因此，最佳涂层具有优异的阻燃性、优异的耐水性和出色的热稳定性。该工作为基于工业废水回用制备高性能膨胀型防火涂料提供了一种实用策略，该涂料有利于环境保护，在行业中具有广阔的前景。我们的结果表明，最佳样品的水接触角和炭化率分别达到 78.9°和 30.1%。因此，最佳涂层具有优异的阻燃性、优异的耐水性和出色的热稳定性。这项工作为基于工业废水回用创造高性能膨胀型防火涂料提供了一种实用的策略，该涂料有利于环境保护，在行业中具有广阔的前景。