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

Inactive Publication Date: 2004-01-28
李永兆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the color developer used in the color-changing silica gel is mostly cobalt chloride (CoCl) with crystal water. 2 ·6H 2 O), on the one hand, its toxicity is large and its isotope Co 60 It is radioactive, so it is more harmful to the human body. On the other hand, cobalt is a precious rare metal, which causes the cost of discoloration silica gel to remain high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The indicator comprises organic solvent with 10-40wtúÑ inorganic salt and 0.1wtúÑ-5wtúÑ chromaticity indicator without cobalt. Thus, factor of polluting environment and harming health to people is removed thoroughly. The invented product is excellent product of environment protection with low cost. Allochroic silica gel made from the invented indicator can be used in multiple regenerations.

Description

technical field [0001] The product relates to a chromaticity indicator for silica gel, a color-changing silica gel prepared by using it, and a preparation method. More specifically, it relates to a color-changing humidity indicator for silica gel, as well as a color-changing silica gel produced by the same and a preparation method thereof. Background technique [0002] Color-changing silica gel is usually made of silica gel as raw material impregnated with cobalt chloride (CoCl 2 ·6H 2 O) The blue glue and color-changing silica gel made of it are partly mixed in the desiccant during use, and the purpose of displaying or detecting the humidity of the entire environment is achieved by using its moisture absorption and discoloration, and it can also be regenerated and reused. Since the color developer used in the color-changing silica gel is mostly cobalt chloride (CoCl) with crystal water. 2 ·6H 2 O), on the one hand, its toxicity is large and its isotope Co 60 It is radi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10G01N31/22
Inventor 李永兆
Owner 李永兆
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