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将稀土元素La引入碳酸根型镁铝锌层状双羟基金属氧化物(LDHs)层板中,合成了晶态结构规整的含稀土元素LDHs(MgAlZnLa-CO3LDHs),将含稀土元素LDHs、膨胀阻燃剂(IFR)和聚丁二酸丁二醇酯(PBS)熔融共混制备出新型PBS膨胀阻燃体系,研究了PBS膨胀阻燃体系的阻燃性能和热性能。结果表明:含稀土元素LDHs的添加量为1%(阻燃剂的总添加量为20%)时PBS阻燃阻燃体系的极限氧指数(LOI)达到33%,垂直燃烧测试达到UL 94 V-0级别;LOI不仅取决于残炭量,还与燃烧炭层的结构有关;含稀土元素LDHs的加入能提高膨胀碳层的致密度和强度,燃烧形成致密度高的碳层能明显降低热释放速率和烟生成速率,有效地降低可燃小分子和烟尘的释放,使膨胀阻燃效率提高。
The rare earth element La was introduced into the lamellar bimetallic oxyhydroxide (LDHs) layer of carbonate-type MgAl-Zn, and the rare earth element-containing LDHs (MgAlZnLa-CO3LDHs) (IFR) and polybutylene succinate (PBS) to prepare a new type of intumescent flame retardant PBS. The flame retardancy and thermal properties of the intumescent flame retardant PBS were studied. The results showed that the limiting oxygen index (LOI) of PBS flame retardant system reached 33% when the content of rare earth element LDHs was 1% (the total amount of flame retardant added was 20%), and the vertical burning test reached UL 94 V -0 level; LOI not only depends on the amount of residual carbon, but also with the structure of the combustion carbon layer; rare earth elements LDHs can increase the density and strength of the expanded carbon layer, combustion to form a dense carbon layer can significantly reduce the heat Release rate and smoke generation rate, effectively reducing the release of flammable small molecules and soot, so that the expansion of the flame retardant efficiency.