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Preparation and Microstructure of Chemical Modified Diatomite as Flame Retardant |
WANG Yachao**(), ZHAO Jiangping |
College of Materials & Mineral Resources, Xi'an University of Architecture and Technology, Xi’an 710055, China |
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Cite this article:
WANG Yachao, ZHAO Jiangping. Preparation and Microstructure of Chemical Modified Diatomite as Flame Retardant. Chinese Journal of Materials Research, 2016, 30(7): 524-530.
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Abstract The diatomite based flame-retardant materials for external thermal insulation board of exterior wall were preparedby sol-gels method with NaOH (2 molL-1) and Na2SiO3 (1 molL-1) simultaneously as the chemical activator, and then characterized by means of various methods. Results showed that aftera thin-plastering of the prepared flame-retardant diatomitewas applied on expandable polystyrene board, the limiting oxygen indexthe complex EPSboard can reached 36.8%, and itscombustion performance can meetthe requirement of UL-94 V1. SEM results demonstrated that the NaOH and Na2SiO3 were benefit for the diatomite to form dense amorphous silica layer, XRD and FT-IR results showed that "depolymerization-reconstruction" of the diatomite structure occurred in the alkaline media, and which would further be reconstructed during firing.
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Received: 27 November 2015
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Fund: *Supported by Doctor Foundation of Xi'an University of Architecture and Technology No RC1519 |
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