Method for preparing inorganic crystal whisker with SiO2-coated surface
A technology of inorganic whiskers and surface coating, which is applied in the field of preparation of SiO2 coated on the surface of inorganic whiskers, can solve problems such as difficulty in operation control, and achieve the effects of high application value, simple and easy operation, and remarkable surface modification effect.
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Embodiment 1
[0014] (1) Dispersion treatment of potassium titanate whiskers: according to the coating amount of 5% (SiO 2 Mass ratio to potassium titanate whiskers) Weigh sodium silicate, dissolve in water 10 times the mass of the whiskers to make a dilute solution, add potassium titanate whiskers to the solution, and ultrasonically disperse for 10 minutes to obtain dispersion A ;
[0015] (2) Potassium titanate whiskers coated with SiO 2 Membrane: Weigh ethyl acetate according to 1 times the amount of sodium silicate, slowly drop it into the dispersion A, and keep it at 60°C for 4 hours while stirring;
[0016] (3) Post-coating treatment: after the reaction is completed, the product is filtered, washed once, filtered and dried to obtain the final product.
[0017] Test results: the actual coating amount is 4.69%, and the thickness is about 50nm
Embodiment 2
[0019] (1) Dispersion treatment of potassium titanate whiskers: according to the coating amount of 10% (SiO 2 Mass ratio to potassium titanate whiskers) Weigh sodium silicate, dissolve in water 10 times the mass of the whiskers to make a dilute solution, add potassium titanate whiskers to the solution, and ultrasonically disperse for 10 minutes to obtain dispersion A ;
[0020] (2) Potassium titanate whiskers coated with SiO 2 Membrane: Ethyl acetate is weighed according to 3 times the amount of sodium silicate, slowly dropped into the dispersion A, and aged at 20°C for 24 hours under stirring;
[0021] (3) Post-coating treatment: after the reaction is completed, the product is filtered, washed once, filtered and dried to obtain the final product.
[0022] Test results: the actual coating amount is 9.62%, and the thickness is about 100nm
Embodiment 3
[0024] (1) Dispersion treatment of calcium sulfate whiskers: 20% by coating amount (SiO 2 Mass ratio to calcium sulfate whiskers) Weigh sodium silicate, dissolve in water 10 times the mass of the whiskers to make a dilute solution, add calcium sulfate whiskers to the solution, and ultrasonically disperse for 10 minutes to obtain dispersion A;
[0025] (2) Calcium sulfate whisker surface coated with SiO 2 Membrane: Ethyl acetate was weighed according to 6 times the amount of sodium silicate, slowly dropped into the dispersion A, and aged at 70°C for 4 hours under stirring;
[0026] (3) Post-coating treatment: after the reaction is completed, the product is filtered, washed once, filtered and dried to obtain the final product.
[0027] Test results: the actual coating amount is 18.92%, and the thickness is about 200nm
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