摘要
高岭石插层复合物作为新型矿物材料现已被广泛应用。然而,插层复合物热稳定性较难控制使其在聚合物中的应用一直受到限制。本文应用热分析、X射线衍射、质谱及发射红外光谱等表征技术对煤系高岭石/醋酸钾插层复合物受热分解产物及微结构变化进行了研究。结果表明,煤系高岭石/醋酸钾插层复合物热相变主要经历以下几个阶段：插层水脱嵌（约350℃）,插层剂醋酸钾脱嵌（约400℃）,脱羟基（约450℃）,偏高岭石形成（450-550℃）,KHCO3出现（约600℃）,KHCO3热分解形成K2CO3和KAl Si O4出现（约700℃）,热解产品K2Al2Si O4出现（约800℃）,K4Al2Si2O3出现（900-1000℃）,大量K3Al O3形成阶段（1100℃及以上）。此外,还发现通过控制插层率和加热温度,可实现高岭石插层复合物的可控分解、新物相合成与转变,从而有利于新材料的合成。
Kaolinite intercalation complexes are new mineral materials and have been widely used. However,the application of intercalation complex in polymer is limited because of its thermal stability. In the present paper,the thermal decomposition and structural modification of coal-bearing strata kaolinite-potassium acetate intercalation complex was studied using thermal analysis,X-ray diffraction（ XRD）,mass spectrometric analysis and infrared emission spectroscopy. The results showed that the thermal phase transformation of coal-bearing strata kaolinite-potassium acetate intercalation complex is mainly divided into the following stages： loss of intercalated water（ 350℃）,loss of intercalated potassium acetate（ 400℃）,dehydroxylation（ 450℃）,formation of metakaolinite（ 450-550℃）,the appearance of KHCO3（ 600℃）,the formation of K2CO3 from the thermal decomposition of KHCO3 and KAl Si O4appearance（ 700℃）,the pyrolysis product K2Al2 Si O4（ 800℃）,the formation of K4Al2Si2O3（ 900℃ and 1000℃）,and the formation stage of K3 Al O3. Moreover,the thermal decomposition,new material formation and phase transformation of kaolinite intercalation complexes was controllable by controlling the intercalation ration and temperature. This will be benefit for the synthesis of new materials.
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2015年第3期526-531,共6页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
北京市科技新星计划项目(XXJH2015B081)
煤炭资源与安全开采国家重点实验室开放基金项目(SKLCRSM14KFB02)
关键词
煤系高岭石
醋酸钾
插层复合物
相变
coal-bearing strata kaolinite
potassium acetate
intercalation complex
phase transition
