Prepn of coated medium chrome yellow pigment
A chrome yellow and pigment technology, applied in the field of preparation of coated lead chromate pigments, can solve problems such as the inability to fully maintain color stability and achieve the effect of overcoming easy spillage
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Embodiment 1
[0020] Put 200g of industrial chrome yellow powder and 1300ml of water into a high-shear emulsifier, stir and disperse, add 8 grams of sodium silicate (containing SiO 2 28.5% by weight) as a dispersant, disperse for 1 hour, and after the pigment particle size is 1um, pump it into the reaction kettle, heat it to 90°C while stirring, and keep a constant temperature. In addition, in a batching pot, add 93% of 26.9 grams of sulfuric acid, diluted to a concentration of 2% by weight, stir, add 186 grams of sodium silicate (containing SiO 2 28.5% by weight), diluted with water to contain SiO 2 Concentration is 6.5% by weight, stir evenly, adopt rotameter to control feeding speed, join sodium silicate and sulfuric acid aqueous solution in the reactor simultaneously, adjust to PH=9, keep stirring for 4 hours, then add aluminum sulfate solution 80 grams ( Aluminum sulfate content 25% by weight), 40 grams of NaOH solution (NaOH content 20% by weight) adjusts PH=6.9, stirs 30min, obtains...
Embodiment 2
[0022] In addition to adding 10 grams of sodium silicate (containing SiO 2 28.5% by weight) as a dispersant, dispersed for 1.5 hours, added 31.4 grams of 93% sulfuric acid after adding water, and the concentration was 3% by weight, and 217 grams of sodium silicate (containing SiO 2 28.5% by weight), diluted with water to SiO 2 Concentration is 5% by weight, adjust PH=6.7, add 100 grams of aluminum sulfate solution (aluminum sulfate content 25 weight %), add 50 grams of NaOH solution (NaOH content 20 weight %), all the other formulations and operation steps are the same as the embodiment 1. The analysis results of the obtained chrome yellow pigment product in the coating show that the oil absorption is 27ml / 100g, the heat resistance is 270°C, the acid resistance is grade 5, and the alkali resistance is grade 5.
Embodiment 3
[0024] In addition to adding sodium silicate (containing SiO 2 28.5% by weight) as a dispersant, dispersed and refined for 2 hours, added 93% sulfuric acid 35.6g after adding water, and the concentration was 4% by weight, and sodium silicate added 246 grams (containing SiO 2 28.5% by weight), diluted with water to SiO 2 The concentration is 8%, adjust PH=10, stir for 5 hours, add 120 grams of aluminum sulfate solution (containing 25% by weight of aluminum sulfate), and add 60 grams of NaOH solution (20% by weight of NaOH content), all the other formulas and operating steps are With embodiment 1. The chrome yellow pigment product in the coating was obtained, and the analysis results showed that the oil absorption was 29ml / 100g, the heat resistance was 280°C, the acid resistance was grade 5, and the alkali resistance was grade 5.
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