Humidity indicator and manufacturing method thereof

A technology of indicator and acid-base indicator, which is applied in the field of humidity indicator and its manufacturing, can solve the problems of humidity indicator not being environmentally friendly, the toxicity of inorganic copper salts, and great harm to the environment and human body, and achieve a wide range of indication and adaptability Good performance and high sensitivity

Inactive Publication Date: 2009-10-14
杨德成 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, inorganic copper salts are basically toxic and harmful to the environment and human body, so this type of humidity indicator is not environmentally friendly

Method used

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  • Humidity indicator and manufacturing method thereof
  • Humidity indicator and manufacturing method thereof
  • Humidity indicator and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] First, use 35% ethanol and bromocresol green to prepare a bromocresol green solution with a mass fraction of 0.1‰; use 35% ethanol and bromothymol blue to prepare a bromothymol blue solution with a mass fraction of 0.1‰. With above-mentioned two kinds of solutions as acid-base indicator of the present invention, take magnesium chloride as hygroscopic salt, carry out acid-base adjustment by 1% dilute sulfuric acid and 0.5% sodium hydroxide solution, according to composition and weight thereof shown in following table 1 A solution for impregnating a carrier is formulated for the humidity indicator of the present invention. The prepared solution is used to impregnate the fibrous carrier according to the method well known to those skilled in the art, and the humidity indicator is obtained after drying. The discoloration of the humidity indicator was tested in different humidity environments, and the results are shown in Table 2.

[0013] Table 1 - Components and weights of...

Embodiment 2

[0019] Firstly, bromocresol green solution with a mass fraction of 0.1‰ was prepared with 30% ethanol and bromocresol green; a methyl red solution with a mass fraction of 0.1‰ was prepared with 30% ethanol and methyl red. With above-mentioned two kinds of solutions as acid-base indicator of the present invention, take lithium chloride as hygroscopic salt, carry out acid-base adjustment by 1% dilute sulfuric acid and 0.5% sodium hydroxide solution, according to composition shown in following table 3 and Its weight formulates the solution for impregnating the carrier of the humidity indicator according to the invention. The prepared solution is used to impregnate the molecular sieve carrier according to the method well known to those skilled in the art, and the humidity indicator is obtained after drying. The discoloration of the humidity indicator was tested in different humidity environments, and the results are shown in Table 4.

[0020] Table 3 - Components and weights of s...

Embodiment 3

[0026] Firstly, a methyl red solution with a mass fraction of 0.1‰ was prepared with 80% ethanol and methyl red; a bromophenol blue solution with a mass fraction of 0.1‰ was prepared with 30% ethanol and bromophenol blue. With above-mentioned two kinds of solutions as acid-base indicator of the present invention, with magnesium chloride and sodium bromide as hygroscopic salt, carry out acid-base adjustment by 1% dilute sulfuric acid and 0.5% sodium hydroxide solution, according to following table 5 INGREDIENTS AND THEIR WEIGHTS The solution for impregnating the carrier of the humidity indicator of the present invention is formulated. The prepared solution is used to impregnate the bentonite carrier according to the method well known to those skilled in the art, and the humidity indicator is obtained after drying. The discoloration of the humidity indicator was tested in different humidity environments, and the results are shown in Table 6.

[0027] Table 5 - Components and we...

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Abstract

The invention provides a humidity indicator which is really effective in environmental protection and comprises a carrier and solution used for soaking the carrier; wherein, the solution takes 30-80% of ethanol as a solvent and contains 0.00862-0.00992% of acid-base indicator and 0.8-13.8% of hygroscopic salt. The acid-base indicator is one of bromocresol green, bromothymol blue, thymol blue, thymolphthalein, bromophenol blue, methyl red, methyl orange, methyl yellow , neutral red and phenol red or the mixture thereof. The hygroscopic salt is alkali halide or alkali-earth metal halide. The humidity indicator of the invention has wide indicating range (capable of indicating 5-90% of ambient humidity) and high sensitivity. Diverse humidity indicators different in discoloration can be manufactured by adjusting the components. The humidity indicator of the invention has evident discoloration effect, simple use, reutilization, good suitability and extensive application.

Description

technical field [0001] The invention relates to a humidity indicator and a manufacturing method thereof, in particular to a cobalt-free humidity indicator and a manufacturing method thereof. Background technique [0002] Cobalt-containing humidity indicators contain a large number of carcinogens and have been gradually replaced by some cobalt-free humidity indicators. Existing cobalt-free humidity indicators basically use inorganic copper salts as effective components, by adding some hygroscopic salts (such as magnesium chloride, calcium chloride, potassium chloride, lithium chloride, sodium chloride, sodium bromide, Magnesium bromide, potassium bromide, lithium bromide and other halides) are prepared. For example, Chinese patent application No. 200810218582.5 discloses a humidity indicator with copper sulfate or copper sulfate pentahydrate as an effective component. However, inorganic copper salts are basically toxic and harmful to the environment and human body, so this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/22
Inventor 杨德成郭向果
Owner 杨德成
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