Light-change data is widely used in the printing ink category. Based on its different uses, there are sleeping-based inks, ink-based inks, plastic inks, and dry-type inks. The method of making such an ink generally involves dissolving a photochromic dyestuff with a solvent to make a microfine pigment capsule, and participating in a binder according to different uses in the dissolved pigment.
The preferred method is to dissolve the photochromic dyestuff into a superposed monomer, and to grind the superfine polymer particles into a powder for use as a pigment. Compared to the microcapsule ink, the ink produced by this method is lightfast. Sexual progress 10 times. These powders can be used as pigments in water-based inks, oil-based inks, and plastic inks, as well as in all types of adhesives.
1 Photochromic water-based screen printing ink
Water-based inks are among the best in the textile industry for their safe use and convenient operation. The use of this water-based ink is intended for screen printing with 80 to 120 mesh, 100°C, 1 minute boring (preferably overnight boring), and then 130°C, 3 min heating bridging to obtain excellent fiber adhesion Products. The characteristics of this water-based ink are as follows:
â— In the sun can be agile color, after shading can be recovered in a short time a colorless condition (different colors are different, yellow through 2 ~ 3min, blue can be completed in an instant);
â— Dispersion performance, can get uniform color printing products;
â— good color rendering and conflict stability;
â— This water-based ink is attributed to liquid ink;
â— Good storage stability and convenient operation.
2 Photochromic oil-based ink
Oil-based inks are primarily used for exterior printing of plastic films and metal plates. This type of ink is intended to be screen printed with 100-200. There are many resins used for adhesives: propylene, epoxy, urethane, silicone denatured resins, and the like. As solvents, there are esters, ketones, etc. Others include mineral turpentine, oil, and the like. In these adhesives composed of resin and solvent to participate in photochromic materials, the viscosity of screen printing inks can be properly adjusted to make oil-based screen printing inks.
3 Photochromic plastic ink
According to investigations, there are very few printing companies that use plastisol screen printing inks in Japan. However, in some countries such as the United States, especially the T-shirt production profession uses this printing ink.
As a kind of ink that is not easy to dry, plastic ink often does not need to clean the screen printing plate. The remaining ink on the plate can also be used on the second day. This plastic ink is made by using polyvinyl alcohol (DOP) plasticizer to expand the ultrafine powder of vinyl acetate copolymer to make screen printing ink. Photochromism can also participate in this plastic polymerization agent to make screen printing ink.
However, when the characteristics of the photochromic material itself are suppressed, the photochromic pigment itself is completely differentiated, and this phenomenon can be expressed only after a few days. Therefore, it is difficult to use it as a product. However, if the plastic resin does not require a vinyl acetate copolymer but uses an ultrafine powder material having the same properties and capable of controlling the photochromic denaturation, it will be an aspirational powdery photochromic plastic ink.
4 Dry and Ink
This type of ink is the most messy type of modern security ink and is now a popular high-tech product. Optically variable inks are reflective inks with a pearlescent and metallic effect, and colorful copying machines and electronic copying machines cannot be copied. Products that are printed with light-variable ink, the ink color patches present a pair of colors. Such as magenta - blue, green - blue, blue - green and so on.
If the pattern is tilted to 60°, the pattern can be transported from one color to another. Because only the ink film on the print product is thicker, it can show obvious color drift phenomenon, so the printing feature is that any other ink and printing method cannot be copied.
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