Preparation method of special titanium dioxide pigment for electrophoretic paint
A technology of titanium dioxide and electrophoretic coatings, applied in electrophoretic coatings, chemical instruments and methods, inorganic pigment treatment, etc., can solve the problem that hiding power and light resistance cannot fully meet the requirements of high-grade electrophoretic coatings, non-ferrous metal impurities cannot be removed cleanly, and particle size distribution is wide, etc. problem, to achieve the effect of excellent hiding power, high light resistance, and improved dispersion performance
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Embodiment 1
[0027] 1.1. Weigh 400g of the primary rutile titanium dioxide powder prepared by the chlorination method. The alumina content in the primary titanium dioxide product is 0.6%. Add deionized water to prepare a slurry with a concentration of 300g / L. The pH meter is used for the entire coating process Detect the pH value of the slurry, adjust the pH of the slurry to 9.0 with sodium hydroxide solution, add potassium silicate solution, the concentration of potassium silicate solution is expressed as SiO 2 Calculated as 50g / L, the amount of potassium silicate solution added is calculated as SiO in potassium silicate 2 accounted for TiO 2 0.1% by weight, dispersed for 20 minutes;
[0028] 1.2. Grinding the dispersed slurry so that the average particle size of the slurry is 280nm, the particle size distribution is calculated by number, and the proportion exceeding 500nm does not exceed 7.6%, and the grinding medium is removed from the slurry;
[0029] 1.3. Heat the ground slurry to 5...
Embodiment 2
[0035] 1.1. Weigh 400g of the primary rutile titanium dioxide powder prepared by the chlorination method. The alumina content in the primary titanium dioxide product is 0.8%. Add deionized water to prepare a slurry with a concentration of 450g / L. The pH meter is used for the entire coating process Detect the slurry pH value, adjust the slurry pH to 10.0 with sodium hydroxide solution, add sodium silicate solution, the concentration of sodium silicate solution is SiO 2 Calculated as 150g / L, the amount of sodium silicate solution added is the amount of SiO in sodium silicate 2 accounted for TiO 2 0.3% by weight, dispersed for 25 minutes;
[0036] 1.2. Grinding the dispersed slurry so that the average particle size of the slurry is 350nm, the particle size distribution is calculated by number, and the proportion exceeding 500nm is not more than 6.8%, and the grinding medium is removed from the slurry;
[0037] 1.3. Heat the ground slurry to 65°C, and maintain this temperature t...
Embodiment 3
[0043] 1.1. Weigh 400g of the primary rutile titanium dioxide powder prepared by the chlorination method. The alumina content in the primary titanium dioxide product is 1.2%. Add deionized water to prepare a slurry with a concentration of 600g / L. The pH meter is used for the entire coating process Detect the pH value of the slurry, adjust the pH of the slurry to 11.0 with potassium hydroxide solution, add potassium silicate solution, the concentration of potassium silicate solution is expressed as SiO 2 Calculated as 300g / L, the amount of potassium silicate solution added is 0.5% based on the weight of silicon dioxide in potassium silicate in the initial titanium dioxide product, and dispersed for 30 minutes;
[0044] 1.2. Grinding the dispersed slurry so that the average particle size of the slurry is 265nm, the particle size distribution is calculated by number, and the proportion exceeding 500nm does not exceed 5.4%, and the grinding medium is removed from the slurry;
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