The color-changing silica gel has the characteristics of non-toxicity and harmlessness, and has strong adsorption to water vapor in the air. At the same time, it can display different colors by changing the amount of crystal water contained in the chlorination drill, mainly used for instruments and meters. The equipment absorbs moisture and rust under closed conditions, and at the same time, it can visually indicate the relative humidity of the environment by blue to red after moisture absorption.
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Silica gel is a porous material having different particle sizes which are suitably dehydrated from a silicic acid gel. Its open porous structure makes it a large surface area per unit mass and can adsorb many substances. It is a good desiccant and adsorbent carrier. Since the adsorption of silica gel is mainly by physical adsorption, it can be used repeatedly after simple treatment. Silica gel is produced by adding acid to an alkali metal silicate (such as sodium silicate) solution, acidifying it, adding a certain amount of electrolyte to stir to form a silicic acid gel, or in a concentrated sodium silicate solution. Acidic acid or money salt can also form a silicic acid gel, and then the silicic acid gel is immersed in a chlorinated drilling solution, then dried and activated to obtain a color-changing silica gel. When it is used as a desiccant, it is blue before water absorption, and turns red after water absorption. The degree of water absorption can be seen from the change of color, and whether regeneration treatment is required.
November 11, 2022