Cobaltless blue color-changing indicator and production method thereof
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An indicator and blue technology, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems of toxicity, environmental and human hazards of inorganic copper salts, copper Problems such as precious metals, to achieve the effect of eliminating pollution and harm to the human body, high commercial value, and good applicability
Inactive Publication Date: 2013-05-08
山东辛化硅胶有限公司
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Problems solved by technology
For example, the Chinese patent application with application number 200810218582.5 discloses a humidity indicator with copper sulfate or copper sulfate pentahydrate as an active ingredient; inorganic copper salts are basically toxic and harmful to the environment and the human body, and copper metals are relatively Expensive, using this indicator is not environmentally friendly
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Effect test
Embodiment 1
[0018] Configure a volume of 3L of sulfuric acid with a mass fraction of 8%, and set it aside; add 3L of hygroscopic silica gel to the prepared sulfuric acid, soak for 4 hours, and then add the soaked silica gel to the mass fraction of 0.05%, 0.01%, and Soak in 0.01% methyl violet, methylene blue, and ethoxypyrroxine solution for 1 hour, take it out, and dry it at 120°C until the moisture content is less than 5%, and you can get this product with a sapphire blue appearance.
Embodiment 2
[0020] Configure a volume of 5L of hydrochloric acid with a mass fraction of 5%, and set it aside; add 4L of hygroscopic silica gel to the prepared hydrochloric acid, soak for 6 hours, and then add the soaked silica gel to the mass fraction of 0.05%, 0.01%, and 0.01%, 0.01% methyl violet, methyl red, quinaldine red, ethoxypyrrole, soak for 1 hour, take it out, then put the silica gel in 6% sulfuric acid for 2 hours, take it out Dry at 110°C until the moisture content is less than 5%, and you can get this product with a dark blue appearance.
Embodiment 3
[0022] Prepare a volume of 4L of nitric acid with a mass fraction of 3%, and set aside; add 3L of hygroscopic silica gel to the prepared hydrochloric acid, soak for 2 hours, and then add the soaked silica gel to the mass fraction of 0.05%, 0.01%, and 0.01%, 0.01% methyl violet, methyl red, methyl orange, and ethoxylated flavin solution, soak for 1 hour, take it out, then put the silica gel in 6% sulfuric acid for 2 hours, take it out Dry at 110°C until the moisture content is less than 5%, and you can get this product with a dark blue appearance.
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Abstract
The invention discloses a cobaltless blue color-changing indicator, which comprises 0.01-0.1wt% of color indicator and a granular compound or mixture with a nano-sized microporous structure or adsorptive property, and is free of cobalt. The production method of the cobaltless blue color-changing indicator comprises the following steps of: (a) preparing the solution of a soaking carrier according to claim 3, and (b) enabling the carrier to contact the solution, and drying the carrier. The cobaltless blue color-changing indicator and the production method of the cobaltless blue color-changing indicator have the advantages that the cobaltless blue color-changing indicator can indicate humidity at a relative humidity of 5-90%, is high in sensitivity, and does not contain cobalt, copper, iron and other metal salts, so that the pollution to environment and the harm to human bodies can be eliminated from source; furthermore, the cobaltless blue color-changing indicator is accordant with conventional blue silica gel in appearance and color display and high in commercial value; and the humidity indicator provided by the invention is obvious in color changing effect, simple to use, capable of being repeatedly used for many times, and good in applicability, and has a very wide application range.
Description
technical field [0001] The invention relates to an adsorption-type humidity indicator and a manufacturing method thereof, in particular to a cobalt-free adsorption-type humidity indicator and a cobalt-free blue color-changing indicator and a manufacturing method thereof. Background technique [0002] At present, the humidity indicator products sold in the domestic and foreign markets are mainly hollow-made spherical silica gel particles and amorphous silica gel (block) particles, and the spherical particle silica gel is mainly fine-pore silica gel, which is mainly used in the air separation industry, catalyst Carrier industry, precision instrument, used as desiccant and adsorbent industry. These industries have high requirements on the adsorption and moisture absorption properties of silica gel, and also have very strict requirements on the adsorption capacity under different humidity. With the rapid development of these industries in the past few years, the demand for fine...
Claims
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Application Information
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