Preparation method for polishing powder used for high performance devices such as liquid crystal display
A liquid crystal display, polishing powder technology, applied in the direction of polishing compositions containing abrasives, etc., to achieve the effect of bright and clean polishing surface, uniform particle size distribution, good dispersion and suspension.
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[0028] Example 1
[0029] (1) Preparation of raw materials: weigh 1 kg of lanthanum cerium carbonate and add hydrochloric acid to prepare a 0.5 mol / L cerium chloride solution, and adjust the pH of the solution to 4 to 4.5 with hydrochloric acid and rare earth carbonate. Weigh 0.305 kg of ammonium bicarbonate to prepare a saturated ammonium bicarbonate solution as a precipitant, and adjust the pH to 8-9 with ammonia water. Prepare 2mol / L potassium chloride solution, weigh 30% of the mass percentage of rare earth oxide powder, prepare 30% polyethylene glycol 20000 solution, weigh the content of 2% of rare earth oxide powder, At the same time, add it to the lanthanum cerium chloride solution and stir evenly;
[0030] (2) Fluorination: Weigh fluorosilicic acid with a weight concentration of 30%, add it to the lanthanum cerium chloride solution at a constant speed under stirring conditions at room temperature, the mass ratio of fluorosilicic acid to lanthanum cerium oxide is 5%, and co...
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[0034] Example 2
[0035] (1) Preparation of raw materials: Weigh 0.6 kg of cerium carbonate and add hydrochloric acid to prepare a 0.4 mol / L cerium chloride solution, and adjust the pH of the solution to 4 to 4.5 with hydrochloric acid and rare earth carbonate. Weigh 0.184 g of ammonium bicarbonate to prepare a saturated ammonium bicarbonate solution as a precipitant, and adjust the pH to 8-9 with ammonia water. Prepare 2mol / L sodium chloride solution, weigh 18% of rare earth oxide powder mass percentage, prepare 30% sodium polyacrylate solution, weigh 1% of rare earth oxide powder mass percentage, and add Into the cerium chloride solution, stir evenly;
[0036] (2) Fluorination: Weigh fluorosilicic acid with a weight concentration of 30%, add it to the cerium chloride solution at a constant speed under stirring at room temperature, the mass ratio of fluorosilicic acid to cerium oxide is 7%, and continue stirring for 10 minutes;
[0037] (3) Precipitation: The fluorinated cerium c...
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[0040] Example 3
[0041] (1) Preparation of raw materials: Weigh 0.8 kg of cerium carbonate and add hydrochloric acid to prepare a 0.8 mol / L cerium chloride solution, and adjust the pH of the solution to 4 to 4.5 with hydrochloric acid and rare earth carbonate. Weigh 0.245 g of ammonium bicarbonate to prepare a saturated ammonium bicarbonate solution as a precipitant, and adjust the pH to 8-9 with ammonia water. Prepare 2mol / L magnesium chloride solution, weigh 25% of the mass percentage of rare earth oxide powder, prepare 30% dispersant LBD-1 solution, weigh 5% of the mass percentage of rare earth oxide powder, and add Into the cerium chloride solution, stir evenly;
[0042] (2) Fluorination: Weigh 30% fluorosilicic acid by weight, add it to the cerium chloride solution at a constant speed under stirring conditions at room temperature, the mass ratio of fluorosilicic acid to cerium oxide is 8%, and continue stirring for 15 minutes;
[0043] (3) Precipitation: The fluorinated ceri...
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