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Environment-friendly humidityindicator composition

An environment-friendly, dry humidity 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 problem of unusable and unusable cobalt chloride dry humidity indicator cards and other problems to achieve the effect of high indication accuracy

Active Publication Date: 2016-03-30
佛山市顺德区特普高实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The problem with humidity sensitive coatings using cobalt chloride for humidity indicator cards is that cobalt chloride is a known heavy metal irritant and toxin and cannot be used as a dry humidity indicator card when used in food and pharmaceutical products, so , the application of the cobalt chloride humidity indicator card is not available in the food and pharmaceutical industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 0.5g of copper sulfate, 4g of iron sulfate and 0.375g of sodium sulfosalicylate, mix and grind for 20 minutes, add distilled water to dissolve, then add 0.75g of pH=4 buffer solution composed of hydrochloric acid and sodium hydroxide, molecular weight 200 Polyethylene glycol 1.5g, vitamin C 0.375g, stir to obtain coating.

[0018] Apply the obtained paint evenly on the substrate of the humidity indicator card, and let it dry naturally to make an environment-friendly dry humidity indicator card. When the relative humidity is 10-40%, the card will display purple, and when the relative humidity is 40-80%, Cards show yellow

Embodiment 2

[0020] Weigh 3.6g of ferric nitrate and 0.18g of sulfosalicylic acid, mix and grind for 15 minutes, add distilled water to dissolve, then add 0.23g of pH=3.5 buffer solution composed of hydrochloric acid and potassium hydroxide, polyethylene glycol with a molecular weight of 400 0.36g of a mixture of alcohol and hyaluronic acid, and 0.14g of vitamin C were stirred evenly to obtain a coating.

[0021] Apply the obtained paint evenly on the substrate of the humidity indicator card and let it dry naturally to make an environment-friendly dry humidity indicator card. When the relative humidity is 10-20%, the card will display purple, and when the relative humidity is 20-80%, Cards appear yellow.

Embodiment 3

[0023] Weigh 3.85g of ferric sulfate and 0.006g of potassium sulfosalicylate, mix and grind for 15 minutes, add distilled water to dissolve, then add 0.55g of buffer solution of pH=3.5 composed of sulfuric acid and sodium hydroxide, D-glucitol and A mixture of 1.089 g of collagen and 0.006 g of benzophenone was stirred evenly to obtain a coating.

[0024] Apply the obtained paint evenly on the substrate of the humidity indicator card and let it dry naturally to make an environment-friendly dry humidity indicator card. When the relative humidity is 10-20%, the card will display purple, and when the relative humidity is 20-80%, Cards appear yellow.

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PUM

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Abstract

The invention provides an environment-friendly humidity indicator composition, consisting of the following components in percentage by mass: 60-80% of hydrosolvent containing Fe<3+> or Cu<2+> compounds, 0.1-5% of sulfo-salicylic acid radial ions, 0.1-10% of ion pair buffer solution, 1-20% of a humectant and 0.1-5% of an antioxidant. Compared with an existing humidity discoloration sensitive coating, the environment-friendly humidity indicator composition does not contain heavy metal elements of cobalt and the like, and halogen, and meets requirements of the Environmental Protection Law. Meanwhile, by using the environment-friendly humidity indicator composition provided by the invention, colors indicated by an indicator card are different under different air humidity, the air humidity in a sealed package can be separately indicated according to different types of color displays, and the indication accuracy is high.

Description

technical field [0001] The invention relates to an environment-friendly dry humidity indicating composition, in particular to a cobalt-free and halogen-free dry humidity indicating composition. Background technique [0002] Humidity management is very important in manufacturing equipment and products in modern industries such as electronics, home appliances, paper, and food packaging. One type of humidity indicator is the humidity indicator card, which is used for a variety of purposes, including determining relative humidity in shipping containers and packaging, such as packaging electronic equipment and communication products. The humidity indicator card is usually impregnated with a moisture-sensitive composition and dried. . Most humidity indicator cards manufactured today use cobalt chloride as the indicator, which changes color based on the degree of hydration of the cobalt chloride in different humidity environments. Cobalt chloride can change from blue (when it has...

Claims

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Application Information

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IPC IPC(8): G01N21/81
CPCG01N21/81
Inventor 何贤培潘国能钟富
Owner 佛山市顺德区特普高实业有限公司