Borisova A. Thermal insulation materials on the basis of modified alkaline aluminosilicate compositions, which is capable to bloat

The object of research - directional regulation of processes of structure formation and bloating under the influence of the temperature factor of alkali aluminosilicate compositions in the system "Na2O-RO-R2O3-SiO2-H2O" (where RO - FeO, MgO; R2O3 - Fe2O3, Al2O3). The subject of research - alkali aluminosilicate composition, modified compounds of magnesium and iron. Research methods - modern methods of physicochemical analysis; statistical methods of experimental design. Novelty - established the dependence of processes of bloating and structure formation of alkali aluminosilicate compositions on the technological parameters of the preparation of reaction mixtures. It is shown that more intensive mixing of the starting mixtures (mixing speed 900 ... 1000 rev / min) changes their reactivity, which increases the coefficient of bloating of compositions during roasting in the temperature range 400 ... 800 C average of 1.1 ... 1.7 times and contributes to the formation of nuclei hydromicas with layered structure in the products of dehydration. It is proved that the modification of the alkaline aluminosilicate compositions of iron and magnesium compounds increases the coefficient of bloating on the average of 1.3 ... 1.8 times compared to unmodified compositions due to the directed synthesis in the new growth of analogs of natural hydromicas, and the type of synthetic hydromicas depends on the type used modifier additives. The influence of the appropriate type of modifying additives on the operational properties of the developed materials is defined, and use iron compounds allows to obtain materials with the lowest average density, the maximum bloating which occurs at relatively low temperatures (200 ... 400 C), and the introduction of magnesium compounds increases the strength of the material in 1.5 ... 2 times compared with the unmodified system and enhances the temperature range of received materials. The results of the work put into production of building materials. Industry - construction.