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Synthesis, Flame-Retardant and Smoke-Suppressant Properties of a Borate-Intercalated Layered Double Hydroxide

Published online by Cambridge University Press:  01 January 2024

Ling Shi ,
Dianqing Li ,
Jianrong Wang ,
Sufeng Li ,
David G. Evans  and
Xue Duan
Ling Shi
Affiliation:
Ministry of Education Key Laboratory of Science and Technology of Controllable Chemical Reactions, Beijing University of Chemical Technology, Beijing 100029, China
Dianqing Li
Affiliation:
Ministry of Education Key Laboratory of Science and Technology of Controllable Chemical Reactions, Beijing University of Chemical Technology, Beijing 100029, China
Jianrong Wang
Affiliation:
Ministry of Education Key Laboratory of Science and Technology of Controllable Chemical Reactions, Beijing University of Chemical Technology, Beijing 100029, China
Sufeng Li
Affiliation:
Ministry of Education Key Laboratory of Science and Technology of Controllable Chemical Reactions, Beijing University of Chemical Technology, Beijing 100029, China
David G. Evans
Affiliation:
Ministry of Education Key Laboratory of Science and Technology of Controllable Chemical Reactions, Beijing University of Chemical Technology, Beijing 100029, China
Xue Duan*
Affiliation:
Ministry of Education Key Laboratory of Science and Technology of Controllable Chemical Reactions, Beijing University of Chemical Technology, Beijing 100029, China
*
*E-mail address of corresponding author: duanx@mail.buct.edu.cn
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Abstract

Reaction of a Mg-Al carbonate layered double hydroxide (LDH) with boric acid leads to a borate-pillared LDH with the stoichiometry [Mg0.65Al0.35(OH)2][B3O5]0.35.0.65H2O and an interlayer spacing of 1.07 nm. Infrared and 11B magic angle spinning nuclear magnetic resonance data are consistent with the presence of polymeric triborate anions of the type [B3O4(OH)2]nn- in the interlayer galleries so that the material can be formulated as [Mg0.65Al0.35(OH)2][B3O4(OH)2]0.35.0.30H2O. The flame-retardant properties of the borate-pillared material and the carbonate precursor in composites with ethylene vinyl acetate copolymer were compared. Introduction of the borate anion leads to a significant enhancement in smoke suppression during combustion without compromising the flammability of the material. This is related to the synergistic effect between the host layers of the LDH and the borate anions uniformly distributed in the interlayer region.

Keywords

BorateFlame RetardantHydrotalciteLayered Double HydroxideLDHSmoke Suppressant
Type
Research Article
Information
Clays and Clay Minerals , Volume 53 , Issue 3 , June 2005 , pp. 294 - 300
Copyright
Copyright © The Clay Minerals Society 2005

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