Preparation method of high-light-resistant titanium dioxide pigment for laminated paper
A technology of titanium dioxide and laminated paper, which is applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems that cannot meet the light resistance performance requirements of high-end laminated decorative paper, and achieve good average particle size and particle size distribution , Improve the opacity, improve the effect of covering power
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Embodiment 1
[0028] 1.1. Weigh 300g of the primary rutile titanium dioxide powder prepared by the chlorination method, add deionized water to prepare a slurry with a concentration of 300g / L, use a pH meter to detect the pH value of the slurry during the entire coating process, and use sodium hydroxide solution Regulate slurry pH to 8.5, add concentration and be 50g / L citric acid solution, wherein the addition of citric acid accounts for TiO 2 0.2% by weight, aging for 20 minutes; 1.2. Heat the ground slurry to 55°C, and maintain this temperature throughout the coating process;
[0029] 1.3. Add 2.0% (in P 2 o 5 accounted for TiO 2 by weight) sodium tripolyphosphate solution, the concentration of sodium tripolyphosphate solution is P 2 o 5 Calculated as 80g / L, at the same time, the concentration is calculated as Al 2 o 3 The aluminum chloride solution calculated at 80g / L maintains the pH value of the slurry at 4.0 and matures for 30 minutes to form a dense aluminum phosphate coating l...
Embodiment 2
[0035] 1.1. Weigh 450g of the primary rutile titanium dioxide powder prepared by the chlorination method, add deionized water to prepare a slurry with a concentration of 450g / L, use a pH meter to detect the pH value of the slurry during the entire coating process, and adjust it with potassium hydroxide solution Slurry pH to 10.5, adding concentration is 80g / L ammonium citrate solution, wherein the addition of ammonium citrate accounts for TiO 2 1.0% by weight, dispersed for 40 minutes;
[0036] 1.2. Heat the ground slurry to 60°C, and maintain this temperature throughout the coating process;
[0037] 1.3. Add 6.0% (in P 2 o 5 accounted for TiO 2 by weight) sodium phosphate solution, the concentration of sodium phosphate solution is P 2 o 5 It is calculated as 100g / L, and the concentration is calculated as Al 2 o 3 The aluminum sulfate solution calculated as 100g / L maintains the pH value of the slurry at 6.0 and matures for 60 minutes to form a dense aluminum phosphate c...
Embodiment 3
[0043] 1.1. Weigh 400g of the primary rutile titanium dioxide powder prepared by the chlorination method, add deionized water to prepare a concentration of 400g / L, use a pH meter to detect the pH value of the slurry during the entire coating process, and adjust the slurry with potassium hydroxide solution pH to 9.5, adding a concentration of 100g / L sodium citrate solution, wherein the amount added to account for TiO 2 0.5% by weight, dispersed for 30 minutes;
[0044] 1.2. Heat the ground slurry to 65°C, and maintain this temperature throughout the coating process;
[0045] 1.3. Add 4.0% (in P 2 o 5 accounted for TiO 2 by weight) sodium hydrogen phosphate solution, the concentration of sodium hydrogen phosphate solution is P 2 o 5 It is calculated as 90g / L, and at the same time, the concentration is determined by Al 2 o 3 The aluminum sulfate solution of 90g / L maintains the pH value of the slurry at 6.5, and matures for 60 minutes to form a dense aluminum phosphate coat...
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