Humidity chromogenic indicator and chromatropic silica gel prepared therwith and its preparing method
A technology of color indication and color-changing silica gel, which is applied to silicon compounds, analysis using chemical indicators, inorganic chemistry, etc., can solve the problems of greater harm to human body, high cost of color-changing silica gel, and high toxicity
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Embodiment 1
[0035] Put 5 kg of fine-pored silica gel with a particle size of 2-5.6 mm that has absorbed moisture into 4000 ml of 0.1 g / % ethanol / water (ethanol: water = 1:90) mixed solution of Acid Bright Yellow G, soak for 30 minutes, remove and then Put it into the humidity color indicator, the humidity color indicator is mixed by 4000ml concentration of 10wt% ferric chloride aqueous solution, 100ml concentration of 0.1wt% ethanol solution of bromophenol dye, after soaking for 2.5 hours , and dried at 110°C until the water content was below 4wt%. The analysis data are shown in Table 1.
Embodiment 2
[0037] Put 5 kg of fine-pored silica gel with a particle size of 2-5 mm after moisture absorption into 0.5 g / l acid bright yellow 2G ethanol / water (ethanol: water = 1:90) mixed solution, the amount of dyeing solution is 4000 ml, soak for 1 hour, pull out and then put into the prepared humidity color indicator (humidity color indicator consists of the ethanol solution of the methyl red of 100ml0.1wt%, the ethanol solution of the bromophenol dyestuff of 100ml 0.1wt% and The ferrous sulfate aqueous solution is prepared, the total volume of the humidity color indicator is 4000ml, and the concentration of ferrous sulfate is 25%). After soaking for 2 hours, dry it at a temperature of 110°C until the water content is below 4%. The analysis data are shown in Table 2.
Embodiment 3
[0039] Put 2.5kg of fine-pore silica gel with a particle size of 0.5-2mm that has absorbed moisture into 1g / l acid scarlet ethanol / water (ethanol:water=1:90) mixed solution, the amount of dyeing solution is 3000ml, and soak for 1 hour Finally, pull it out and put it into the 3000ml humidity color indicator (bromophenol dyes account for 0.01wt% in the humidity color indicator; iron (III) ammonium accounts for 30wt%), pull out the drying water after soaking for 2 hours Parts to below 4wt%, the analytical application data is shown in Table 3 below.
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