Nano silicon dioxide with surface grafted sulfonate and its preparation method and use
A kind of nano-silica, branch sulfonate technology, applied in the field of flame retardant technology, nano-silica and its nano-composite materials
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Embodiment 1
[0070] The nano-silica used is Degussa A-200, prepared by gas phase method, the primary particle size is 12nm, and the specific surface area is 200±25m 2 / g. The surface contains hydroxyl groups and unsaturated residual bonds, and has strong hydrophilicity.
[0071] Weigh 30 g of benzoyl chloride, stir at room temperature under the protection of nitrogen, then add the above-mentioned 1 g of nano-silicon dioxide and stir to form a nano-silicon dioxide dispersion suspension; under the protection of nitrogen, the suspension is filtered after heating and stirring for 3 hours, and The filter cake obtained after filtration was washed three times with ethanol and methanol respectively, and the solvent consumption for each washing was 200 ml. Put the washed modified nano silicon dioxide into a vacuum oven, and dry it at 105° C. for 6 hours. React the obtained modified silicon dioxide with excess chlorosulfonic acid to sulfonate the phenyl group in the benzoyl group grafted onto the ...
Embodiment 2
[0075] The nano-silica used is Degussa A-200, prepared by gas phase method, the primary particle size is 12nm, and the specific surface area is 200±25m 2 / g. The surface contains hydroxyl groups and unsaturated residual bonds, and has strong hydrophilicity.
[0076] Weigh 30 g of benzoyl chloride, stir at room temperature under the protection of nitrogen, then add the above-mentioned 1 g of nano-silicon dioxide and stir to form a nano-silicon dioxide dispersion suspension; under the protection of nitrogen, the suspension is filtered after heating and stirring for 3 hours, and The filter cake obtained after filtration was washed three times with ethanol and methanol respectively, and the solvent consumption for each washing was 200 ml. Put the washed modified nano silicon dioxide into a vacuum oven, and dry it at 105° C. for 6 hours. The obtained modified silicon dioxide was reacted with excess chlorosulfonic acid, the benzoic acid grafted onto the silicon dioxide was sulfona...
Embodiment 3
[0080] The nano-silica used is Degussa A-200, prepared by gas phase method, the primary particle size is 12nm, and the specific surface area is 200±25m 2 / g. The surface contains hydroxyl groups and unsaturated residual bonds, and has strong hydrophilicity.
[0081]Weigh 30 g of methyl benzoate, stir at room temperature, then add the above-mentioned 1 g of nano-silica and 0.45 g of sodium methoxide, and stir to form a nano-silica dispersion suspension; the suspension is heated and stirred for 3 hours under nitrogen protection Filter, and wash the filter cake obtained after filtering three times with ethanol and methanol respectively, and the solvent consumption for each washing is 200ml. Put the washed modified nano silicon dioxide into a vacuum oven, and dry it at 105° C. for 6 hours. The obtained modified silicon dioxide was reacted with excess chlorosulfonic acid, and the benzoic acid grafted onto the silicon dioxide was sulfonated, the sulfonated product was filtered, ad...
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Abstract
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