The irreversible thermochromic pigment is a novel coloring agent, which can produce a specific color at a certain ambient temperature, so that the trademark, packaging, etc. have a one-time detection effect. That is, after the irreversible heat-sensitive material obtains a certain amount of heat energy, the color-developing agent and the color-developing agent chemically change to show the color. At present, in the printing industry, color-changing pigments have been applied more and more widely. The use of color-changing pigments can be used to modulate various inks such as gravure, silk screen, and embossing. In particular, the application of gravure and silk screen color-changing inks is more common.
Irreversible thermochromic pigments have some special properties that differ from ordinary pigments and must be observed during use to achieve good results.
1. The basic properties of irreversible thermochromic pigments:
The irreversible thermochromic pigment consists of a color former and a color developer and several auxiliary agents. Since the color-developing agent and the color-developing agent can also exhibit a chemical reaction under the conditions other than the heat source, thereby displaying the color, the following principles must be followed in the preparation and use of the color-changing ink:
1.1 After the coloring agent and developer are mixed, it cannot be ground with a three-roller, a ball mill or a sand mill.
Grinding causes a chemical reaction between the color former and the color developer, thereby displaying color and failing to achieve the desired detection effect. Therefore, when preparing the ink, the components such as resin, solvent and filler should be separately grounded with the coloring agent and coloring agent to form an ink, and then the two should be thoroughly mixed.
1.2 Select the appropriate solvent when adjusting the ink
The color formers and color developers can be dissolved in solvents such as toluene, xylene, butyl acetate, cyclohexanone, methanol, ethanol, acetone, propanol, isopropanol, and butanol, so that chemical reactions occur and colors are displayed. Cannot be used to make this type of ink. At present, it is mainly used to produce water-based gravure ink, silk screen ink, and convex ink. The solvents are mainly water and varnish. Water-based screen ink solvent is distilled water.
2, ink use matters needing attention
2.1 The storage temperature of the ink is below 30 Â°C. Do not place it in an environment above 40 Â°C for a long time. Otherwise, it will be ineffective.
2.2 The ink should not be exposed to strong sunlight, otherwise it is easy to fail.
2.3 The samples printed with this ink are stored under the same conditions as above.
2.4 Samples printed with this ink should not be subjected to severe friction during transportation. Otherwise, friction will generate heat, causing irreversible discoloration and failure to verify authenticity.
2.5 Avoid the contamination of solvents such as toluene, xylene, butyl acetate, cyclohexanone, methanol, ethanol, acetone, propanol, isopropanol, and butanol during the printing process, transportation process, and storage process. Otherwise, these solvents will be used. Irreversible discoloration can occur and loss of detection.
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