Preparation method of zirconium silicate wrapped high-temperature sulfur cadmium selenide bright red pigment
A technology of cadmium sulfoselenide and zirconium silicate, which is applied in the field of pigments, can solve the problems of high sintering temperature and long synthesis time, and achieve the effects of low preparation cost, shortened synthesis time, and shortened washing time
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[0017] The invention provides a preparation method of zirconium silicate-wrapped high-sulfur selenium cadmium scarlet pigment, the process principle is: the formation temperature of cadmium sulfur selenide mixed crystal is very different from the formation temperature of stable and transparent zirconium silicate in glaze Large, when the two are synthesized at high temperature, the two do not undergo a second-generation reaction, and the high-temperature unstable cadmium sulfoselenide mixed crystal is immediately sandwiched in the zirconium silicate crystal that does not participate in the mixed crystal (forming a coating), so that the sulfoselenide The good color characteristics of cadmium combined with the high temperature stability of zirconium silicate result in a stable scarlet pigment (pigment). Its process steps mainly include:
[0018] 1. Gel synthesis section: Selenium powder dissolution, chromium gel formation, high gel formation and silica gel formation.
[0019] 2....
Embodiment 1
[0024] Step 1. Prepare an acid solution according to the following components (percentage by weight): dissolve cadmium sulfate in water and mix it with an aqueous solution of zirconium oxychloride, wherein cadmium sulfate: zirconium oxychloride: water = 6%: 22%: 72%.
[0025] Step 2. Preparation of alkaline solution: Dissolve sodium sulfide in water, add caustic soda and selenium powder, stir and dissolve at 20-40°C, the optimum temperature is controlled at 30°C, wherein sodium sulfide: caustic soda: selenium powder: water=6.5%: 8.5%: 1%: 84%.
[0026] Step 3. Synthesis of gel solution: Add the prepared acidic solution and alkaline solution dropwise into a reaction kettle containing an appropriate amount of water while stirring, and control the pH value from 7.5 to 8.5. The optimal pH value is 8.
[0027] Step 4. Silica gelation: filter the gel liquid through the filter cake, add water to make a slurry, stir for 2 hours, add water glass to the reaction kettle, where by weight ...
Embodiment 2
[0032] Step 1. Prepare an acidic solution according to the following components (percentage by weight): dissolve cadmium sulfate in water and mix it with an aqueous solution of zirconium oxychloride, wherein cadmium sulfate: zirconium oxychloride: water = 10%: 23%: 67%.
[0033] Step 2. Preparation of alkaline solution: Dissolve sodium sulfide in water, add caustic soda and selenium powder, stir and dissolve at 20-40°C, the optimum temperature is controlled at 30°C, wherein sodium sulfide: caustic soda: selenium powder: water=6.5%: 8.5%: 1%: 84%.
[0034] Step 3. Synthesis of gel solution: Add the prepared acidic solution and alkaline solution dropwise into a reaction kettle containing an appropriate amount of water while stirring, and control the pH value to 8.
[0035] Step 4, with step 4 of embodiment 1.
[0036] Step 5, drying ingredients: dry the silicone gel at 110°C, add lithium fluoride, ammonium fluoride and sodium fluorosilicate, and the ratio is: silicone gel: lith...
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