Heatproof-type iron oxide yellow pigment and preparation method thereof
A heat-resistant technology of iron oxide yellow, applied in anti-corrosion coatings, powder coatings, coatings, etc., can solve the problems of poor thermal stability of iron oxide yellow, coloring application restrictions, etc., achieve high industrial application value, simple synthesis method, durable good thermal performance
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Embodiment 1
[0021] Weigh 20Kg iron oxide yellow pigment 810#, disperse the iron oxide yellow evenly in 200 L of water under stirring to form a mixed solution with iron oxide yellow content of 10%; respectively weigh 3.35Kg zinc chloride and 2.53Kg sodium hexametaphosphate , 1.64Kg of sodium hydroxide, respectively dissolved in 100 L of water to prepare solution A, solution B and solution C; then solution A, solution B and solution C were added to the yellow iron oxide mixture while stirring, the reaction temperature was controlled at 80℃, after the solution is added, continue to stir for 3 h; after pressing and washing, the filter cake is dried and crushed at 90℃ to obtain the heat-resistant yellow iron oxide product A.
Embodiment 2
[0023] Weigh 10Kg of iron oxide yellow pigment 810#, disperse the iron oxide yellow evenly in 200 L of water under stirring to form a mixed solution with an iron oxide yellow content of 5%; respectively weigh 4.65Kg zinc nitrate, 1.68Kg sodium hexametaphosphate, 1.31Kg of sodium hydroxide were dissolved in 30 L of water to prepare solution A, solution B and solution C; then solution A, solution B and solution C were added to the yellow iron oxide mixture while stirring, and the reaction temperature was controlled at 70 ℃, after the solution is added, continue to stir for 10h; after pressing and washing, the filter cake is dried and crushed at 100℃ to obtain the heat-resistant iron oxide yellow product B.
Embodiment 3
[0025] Weigh 30Kg of iron oxide yellow pigment 810#, disperse the iron oxide yellow evenly in 100 L of water under stirring to form a mixture with a content of iron oxide yellow of 30%; respectively weigh 3.97Kg zinc sulfate, 2.53Kg sodium hexametaphosphate, 1.64Kg of sodium hydroxide, respectively dissolved in 80 L of water to prepare solution A, solution B and solution C; then solution A, solution B and solution C were added to the yellow iron oxide mixture while stirring, the reaction temperature was controlled at 50 ℃, after the solution is added, continue to stir for 18h; after pressure filtration and washing, the filter cake is dried and crushed at 80℃ to obtain the heat-resistant yellow iron oxide product C.
[0026] Heat resistance test: Weigh 2g of the product, put it into a small crucible, heat it in a 270℃ oven for 0.5h, take it out and cool it, and then test the color difference value ΔE on the spectrophotometer. The ΔE of the heat-resistant yellow iron oxide product ...
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