Humidity indicator and preparation method thereof

A technology of indicator and humidity, applied in the field of humidity indicator and its preparation, to achieve high sensitivity effect

Active Publication Date: 2009-09-30
JIANGSU SUD CHEM PERFORMANCE PACKAGING MATERIALCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to overcome the defect of existing humidity indicator, provide a kind of humidity indicator that does not contain cobalt dichloride and copper salt

Method used

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  • Humidity indicator and preparation method thereof
  • Humidity indicator and preparation method thereof
  • Humidity indicator and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: Water, cobalt sulfate heptahydrate and sodium bromide were used to prepare humidity indicators for indicating different humidity environments. See Table 1 for the indicated humidity and component content.

[0015] Table 1

[0016] Corresponding to indicated humidity water (g) Cobalt sulfate heptahydrate (g) Sodium bromide (g) 5％ 97.5 2 0.5 8％ 95 3 2 10％ 90 7 3 15％ 80 15 5 20％ 70 20 10 30％ 60 25 15 40％ 50 30 20 50％ 40 35 25 60％ 30 40 30

Embodiment 2

[0017] Example 2: Water, cobalt nitrate hexahydrate and magnesium bromide were used to prepare a humidity indicator for indicating different humidity environments. See Table 2 for the indicated humidity and component content.

[0018] Table 2

[0019] Corresponding to indicated humidity water (g) Cobalt nitrate hexahydrate (g) Magnesium bromide (g) 5％ 95.5 3.5 1 8％ 92 6 2 10％ 89 8 3 15％ 78 15 7 20％ 67 19 14 30％ 58 22 16 40％ 51 28 21 50％ 42 33 25 60％ 34 38 28

Embodiment 3

[0020] Example 3: Water, cobalt nitrate hexahydrate, cobalt sulfate heptahydrate, sodium bromide and magnesium bromide were used to prepare humidity indicators for indicating different humidity environments. See Table 3 for the indicated humidity and component content.

[0021] table 3

[0022]

[0023] 40％ 51 13 11 10 11 50％ 42 15 18 10 15 60％ 34 15 23 18 10

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Abstract

The invention provides a humidity indicator which comprises carrier and solution dipping the carrier, the solution contains the following components according to the weight percent: 30-97.5 of water, 2-40 of cobalt salt and 0.5-30 of bromine salt, wherein the cobalt salt is cobalt sulfate heptahydrate and / or cabaltous nitrate hexahydrate. The humidity indicator contains no cobalt chloride and copper salt but can show the indication effect of the common humidity indicator, is blue in the drying state and pink in the wet state and has high sensitivity. The invention also provides a preparation method of the humidity indicator.

Description

technical field [0001] The invention relates to a humidity indicator and a preparation method thereof, in particular to a humidity indicator without cobalt dichloride and copper ions and a preparation method thereof. Background technique [0002] At present, the known humidity indicators are formed by impregnating different concentrations of cobalt dichloride solutions onto different types of carriers and baking. However, according to EU environmental regulations 67 / 548 / CEE, cobalt chloride has been listed as a second-class carcinogen, and thus its use is prohibited. Therefore, a humidity indicator with copper salt as the main active component has appeared, but because it contains a large amount of toxic substance Cu 2+ , have huge risks and harms to the environment, especially the water environment and the human body. Moreover, the color change of the humidity indicator with copper salt as the main active component is from brownish yellow in the dry state to light blue or...

Claims

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Application Information

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IPC IPC(8): G01N31/22
Inventor 杨德成郭向果
Owner JIANGSU SUD CHEM PERFORMANCE PACKAGING MATERIALCO
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