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Study on new conditions for preparation of highly-dispersed hexagonal magnesium hydroxide nanoparticles from hydromagnesite
Received date: 2020-08-17
Online published: 2021-02-06
Nano-sized highly-dispersed hexagonal magnesium hydroxide as the flame retardant was prepared from hydromag-nesite by a simple synthesis route by calcination-hydration-calcination-hydrothermal method.After the initial process was con-firmed,the effects of magnesium oxide(MgO) dosage,hydrothermal temperature and hydrothermal time on the crystallinity and morphology of Mg(OH)2 were investigated.Finally,the optimized hydrothermal conditions were determined as follows:MgO dosage was 10%~25%(mass fraction),hydrothermal temperature was 150 ℃ and hydrothermal time was 3 h.Polyvin-ylpyrrolidone(PVP),cetyltrimethylammonium bromide(CTAB),polyethylene glycol 6000(PEG6000) and polyethylene gly-col 200(PEG200) were separately added to the reaction system during the hydrothermal process to explore the effects of dif-ferent modifiers and mass fractions of the modifier on the crystallinity and dispersibility of Mg(OH)2 nanoparticles.Result showed that the dispersibility of Mg(OH)2 nanoparticles can be well improved using 4%(mass fraction) PVP and finally hexa-gonal nano-Mg(OH)2 with high dispersibility,complete crystal shape,uniform particle size,300~400 nm diameter and 40~60 nm thickness was obtained.
Key words: hydromagnesite; magnesium hydroxide; magnesium oxide
Jiancui Huang , Guanshuang Ling , Jun Zong . Study on new conditions for preparation of highly-dispersed hexagonal magnesium hydroxide nanoparticles from hydromagnesite[J]. Inorganic Chemicals Industry, 2021 , 53(2) : 55 -60 . DOI: 10.11962/1006-4990.2020-0152
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