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
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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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