Preparation and Flame Retardant Properties of Calcium–Aluminium Hydrotalcite with Root Cutting Silicate Layers as Bamboo Flame Retardants

阻燃剂 竹子 共沉淀 材料科学 氢氧化物 层状双氢氧化物 化学工程 结晶 氢氧化铝 复合材料 工程类
作者
Ailian Hu,Chungui Du,Yating Hua,Yingying Shan,Chunlin Liu,Shiqin Chen,Qi Li,Hongwei Yu
出处
期刊:Materials [Multidisciplinary Digital Publishing Institute]
卷期号:14 (23): 7319-7319 被引量:7
标识
DOI:10.3390/ma14237319
摘要

Bamboo has been widely used in architecture, decoration and other fields because of its advantages of short growth period, high strength and degradability. However, bamboo, as a combustible material like wood, are easy to burn and cause building fires. However, the existing bamboo water-based flame retardants have some shortcomings, such as strong hygroscopicity and easy loss, which limits the application of bamboo products. In order to improve the flame retardant performance of bamboo, CaAl-SiO2 layered double hydroxide (LDH) as bamboo flame retardant was synthesised by coprecipitation method. The influence of preparation technology on CaAl-SiO3-LDH structures and properties as well as the flame retardant and smoke suppression characteristics of flame retardant-treated bamboo was discussed. The results revealed that the crystallisation temperature, crystallisation time and crystallisation concentration of CaAl-SiO3-LDHs considerably affected its structure and properties. The optimum technological parameters for preparing CaAl-SiO3-LDHs by using the coprecipitation method are as follows: crystallisation temperature of 100 °C, crystallisation time of 9 h and Ca2+ solution molar concentration of 0.33 mol/L. Compared with nonflame-retardant wood, CaAl-SiO3-LDH flame retardant treatment delayed the peak time of the heat release rate by 20 s and the ignition time by 77.78% and increased the carbon residue rate by 9.54%. This study can provide reference for the research of new flame retardant for bamboo products.
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