Hydration resistance of modified light-burned MgO fine powders
Regarding the easy-hydration of MgO,light-burned MgO fine powders were modified by mixing,grinding and heat-treatment using glycol and ISOBAM-104 as the modifiers.The effects of the ISOBAM-104 addition(0,1％,3％,5％,7％and 9％of the mass of MgO fine powder)and the heat treatment temperature(200,250 and 300 ℃ for 1 h)on the phase composition,microstructure and hydration resistance of the modi-fied light-burned MgO(IM/EG-MgO)were investigated.The results show that the hydration mass gain rate of the light-burned MgO powder modified by ISOBAM-104(7％of the mass of MgO fine powder)heat treated at 250 ℃ for 1 h is the lowest,which is 2.2％.The main reason for the improved hydration resistance of IM/EG-MgO is the generation of alcoholic magnesium compounds and hydrophobic imide groups on the surface.
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