(1. 中南大學(xué) 化學(xué)化工學(xué)院，長沙 410083；
2. 中國鋁業(yè)股份有限公司 鄭州研究院，鄭州 450041)
摘 要: 根據(jù)晶體成核與生長理論，使新生成的氫氧化鎂以非均相成核方式均勻地沉積在氫氧化鋁核材表面，形成氫氧化鎂包覆氫氧化鋁的核−殼結(jié)構(gòu)，制備出兼有氫氧化鋁和氫氧化鎂優(yōu)點(diǎn)的復(fù)合阻燃劑。研究溫度、復(fù)合阻燃劑中氫氧化鋁與氫氧化鎂質(zhì)量比、加料方式等對復(fù)合阻燃劑性能的影響，通過研究不同因素對鋁鎂復(fù)合阻燃劑熱穩(wěn)定性的影響效果，得到優(yōu)化的工藝條件。結(jié)果表明：制備的鋁鎂復(fù)合阻燃劑初始熱分解溫度可提高到260 ℃，阻燃性能得到進(jìn)一步提高，填充有機(jī)高聚物后其氧指數(shù)達(dá)到33，主要力學(xué)性能指標(biāo)均優(yōu)于國家標(biāo)準(zhǔn)要求值。
關(guān)鍵字: 鋁鎂復(fù)合阻燃劑；非均相沉淀；熱穩(wěn)定性
（1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. Zhengzhou Research Institute, Aluminum Corporation of China Limited, Zhengzhou 450041, China）
Abstract:According to the theory of crystal nucleation and growth, magnesium hydroxide was deposited on the surface of ATH by heterogeneous precipitation and the core-shell structure where aluminum hydroxide was coated with magnesium hydroxide was formed, then the composite flame retardant with both advantages of magnesium hydroxide and aluminum hydroxide was produced. The effects of synthetical temperature, the mass ratio of aluminum hydroxide to magnesium hydroxide in composite material and the addition manner of reactive materials on performance of the composite flame retardant were studied. The optimized process parameters were identifies by studying the effect of different factors on its thermo stability. The initial thermo-decomposed temperature of the composite flame retardant is increased to 260 ℃ and its flame retarding performance is improved. The oxygen index of the high polymer filled with it can reach 33 and the main mechanical performance outweighs the demand value of national standards.
Key words: aluminum magnesium composite flame retardant; heterogeneous precipitation; high thermo-stability
