Novel blue variable colour indicator agent and producing process thereof

Abstract

The present invention discloses a blue discoloration indicator. It is made up by utilizing tangible granular adsorbent of silica gel and alumino silica gel and making it undergo the process of cobaltless dyeing solution treatment. It has the following physical and chemical indexes: adsorptive capacity below RH20% is 3.0-12.0%, adsorptive capacity below RH5-% is 10.0-30.0% and heating loss is less than or equal to 5.0%, and the reversible discoloration range is that under the condition of RH10%,20%,35% and 50% it can display blue, blue-purple, mauve and red. Said indicator can be used for absorbing water content in neutral gas.

Description

technical field

[0001] The invention relates to the improvement of an indicator product for environmental dry-humidity change, specifically a novel blue color-changing indicator and a production method thereof, which belong to the technical field of inorganic chemical industry. Background technique

[0002] At present, blue glue and blue glue indicator are mainly used to indicate environmental changes. The indicator is usually made of silica gel, which is impregnated with cobalt chloride (CoCl 2 .6H 2 O) Made from liquid dye. The indicator is used directly or partly mixed in the desiccant, and the color changes when it absorbs moisture: from blue to red, so as to achieve the purpose of color development or detection of the humidity of the whole environment. Since the blue gum indicator is made of cobalt chloride (CoCl 2 .6H 2 O), this compound has been studied by relevant foreign departments. Its toxicity is harmful to the human body, so it is listed as a second-class ca...

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