Preparation method of hydrophobic ultrafine silicon dioxide for coating agent
A technology of ultra-fine silica and silica, applied in chemical instruments and methods, coatings, dyeing organosilicon compound treatment, etc., can solve problems such as inability to bond
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Embodiment 1
[0020] A kind of preparation method of the hydrophobic superfine silicon dioxide that is used for coating agent, this preparation method comprises the steps:
[0021] (1) Put 5Kg of dry powdered precipitated silica with a particle size of 8 μm to 12 μm and 5 Kg of dry powdered precipitated silica with a particle size of 3 μm to 7 μm in a glass container and mix evenly;
[0022] (2) Mix 2% formic acid aqueous solution and methanol according to the ratio of 2:5 by weight to obtain a formic acid-methanol mixture, slowly pour the formic acid-methanol mixture into a glass container, the weight of the formic acid-methanol mixture is two different particle sizes 15% by weight of the silicon oxide mixture, kept stirring for 30 minutes;
[0023] (3) The hydrophobically modified silane coupling agent 3-aminopropyltriethoxysilane is atomized, and then evenly sprayed into the glass container by the atomization reactor, and the addition amount of the hydrophobically modified silane couplin...
Embodiment 2
[0028] A kind of preparation method of the hydrophobic superfine silicon dioxide that is used for coating agent, this preparation method comprises the steps:
[0029] (1) Put 10Kg of dry powdered sol-gel method silica with a particle size of 8 μm to 12 μm and 5 Kg of dry powdered sol-gel method silica with a particle size of 3 μm to 7 μm in a glass container and mix evenly;
[0030] (2) Mix 2% formic acid aqueous solution and methanol according to the weight ratio of 1:6 to obtain a formic acid-methanol mixture, slowly pour the formic acid-methanol mixture into a glass container, the weight of the formic acid-methanol mixture is two different particle sizes 20% by weight of the silicon oxide mixture, kept stirring for 20 minutes;
[0031] (3) Atomize the hydrophobically modified silane coupling agent N-(2-aminoethyl-3-aminopropyl)methyldimethoxysilane, and then evenly spray it into the glass container through the atomization reactor, The addition amount of the hydrophobically...
Embodiment 3
[0036] A kind of preparation method of the hydrophobic superfine silicon dioxide that is used for coating agent, this preparation method comprises the steps:
[0037] (1) Put 5Kg of dry powdered precipitated silica with a particle size of 8 μm to 12 μm and 10 Kg of dry powdered sol-gel silica with a particle size of 3 μm to 7 μm in a glass container and mix evenly;
[0038] (2) Mix 2% formic acid aqueous solution and methanol according to the ratio of 1:8 by weight to obtain a formic acid-methanol mixture, slowly pour the formic acid-methanol mixture into a glass container, the weight of the formic acid-methanol mixture is two different particle sizes 25% by weight of the silicon oxide mixture, kept stirring for 40 minutes;
[0039] (3) Atomize the hydrophobically modified silane coupling agent 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane, and then evenly spray it into the glass container through the atomization reactor, and then hydrophobically modify The amount of the silane...
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