Synthetic zinc hectorite via hydrothermal preparation
A technology for synthesizing lithium montmorillonite and montmorillonite, which is applied in the directions of lithium compounds, zinc compounds, cosmetic preparations, etc., and can solve the problem of unacceptable particle size of hectorite
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[0198] The preparation (method 2) of formula (1) synthetic zinc hectorite sheet comprises steps:
[0199] A reaction mixture is formed comprising the following components:
[0200] selected from K + 、Na + , Li + , NH 4 + and mixtures thereof, preferably Li + 、Na + Sources of I from the group consisting of and mixtures thereof;
[0201] Source of lithium, source of silicon; source of zinc,
[0202] optionally a source of fluoride and / or a source of hydroxide, preferably hydroxide;
[0203] and
[0204] optionally pre-formed seeds of zinc hectorite,
[0205] hydrothermally treating the reaction mixture under alkaline conditions at a temperature of about 150 to about 250° C. and a pressure of about 50 to about 400 psi to form synthetic zinc hectorite flakes;
[0206] and
[0207] Synthetic hectorite formed is optionally isolated, wherein the silicon source is colloidal silica.
[0208] It is also possible to combine the above two approaches, that is, to use colloidal...
Embodiment 1
[0385] Synthesis of zinc hectorite (Li x Zn 3-x Li x Si 4 o 10 (OH) 2
[0386] The starting reagents were colloidal silica, zinc sulfate heptahydrate and lithium hydroxide. Add 2M LiOH solution to the zinc sulfate and swirl the contents to mix. Water was added and the reaction mixture was transferred to a Parr reactor. Colloidal silica is added to form a hydrogel. The Parr reactor was sealed and placed in an oven at 200°C for 24-72 hours. When cooled to room temperature, the reaction was filtered and washed with D.I. water to give a white powder.
[0387] Gel ratio: 6LiOH, 4SiO 2 , 2ZnSO 4 , 226H 2 O, 19 wt% solids
Embodiment 2
[0389] Synthesis of zinc hectorite (Li x Zn 3-x Li x Si 4 o 10 (OH) 2
[0390] The starting reagents were colloidal silica, zinc sulfate heptahydrate and lithium hydroxide. Add 2M LiOH solution to the zinc sulfate and swirl the contents to mix. Water and trisodium citrate dihydrate were added and the reaction mixture was transferred to a Parr reactor. Colloidal silica is added to form a hydrogel. The Parr reactor was sealed and placed in an oven at 200°C for 24-72 hours. When cooled to room temperature, the reaction was filtered and washed with D.I. to give a white powder.
[0391] Gel ratio: 6LiOH, 4SiO 2 , 2ZnSO 4 , 226H 2 O, .03M trisodium citrate dihydrate, 19 wt% solids
[0392] Zinc hectorite coated with titanium dioxide
[0393] Zinc hectorite was coated with titanium dioxide according to methods known in the art to form effect pigments.
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