Preparation and application of the hottest light s

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The preparation and application of light storing ink (Part 1)

the printing technology of fluorescent ink has been introduced in detail in some books and periodicals in the past, but today the light storing ink introduced in this paper is quite different from fluorescent ink. Light storing ink will be a kind of ink with a wide range of applications in the field of modern printing. It can be applied to the printing of official documents, securities, certificates and high-grade cigarettes, alcohol, drugs, cosmetics, and even to some currencies

the main component of fluorescent ink is fluorescent pigment. As long as we are a conscientious person, the main component of light storage ink is light storage pigment. The difference between these two types of pigments is:

fluorescent pigment

when foreign light (including ultraviolet light) irradiates, a certain form of energy absorbed will not be converted into heat energy, but will stimulate photons to release the absorbed energy in the form of low visible light, resulting in fluorescence of different colors, The combination of different colors and light forms unusually bright colors, and when the light stops, the luminescence phenomenon disappears, so it is called fluorescent pigment. Fluorescent ink has poor light resistance and is not suitable for long-term outdoor use

light storage pigment

and light storage pigment is a kind of long afterglow luminescent material, which is called long afterglow material for short, also known as noctilucent material. Only when structural defects and impurity defects are produced in the crystal lattice of the crystal formed in the synthesis process of this kind of material, can it have luminescence properties. The luminescence caused by lattice defects of materials is called self-excited luminescence, and the luminescence caused by impurity defects is called activated luminescence. Most of the practical luminescent materials are activated luminescent materials. Luminous materials are based on the principle of luminescence. Its excitation light source is generally sunlight and artificial light source (light). The length of luminescence varies, and it does not contain radioactivity. It is safe for people and the environment. This kind of luminescent material emits light in the dark environment without external light source, and its luminescent time is called afterglow. Long afterglow luminescent materials are a kind of luminescent materials that absorb the excitation light energy and store it. After the light excitation stops, the stored energy is slowly released in the form of light, and can last for several or even more hours

the process of absorbing light → emitting light → storing → emitting light again, which can be repeated infinitely many times, can be the same as the battery in people's hands, and the principle of charging → discharging → recharging → discharging is similar. Therefore, it is suggested that the long afterglow luminescent material be called light storing luminescent material, and the ink prepared with this material is naturally called light storing ink. The application fields of long afterglow materials are quite wide, and there are many kinds of products. The long afterglow materials are made into luminous paint, luminous ink, luminous plastic, luminous fiber, luminous paper, luminous glass, luminous ceramics, luminous marble, luminous concrete, which can be used in safety emergency, transportation, building decoration, instruments, electrical switch display, daily consumer goods decoration and many other aspects. Now, the deployment methods and precautions of light storage ink and light storage printing paste related to the printing industry are introduced as follows:

first, the name of light storage ink (light-emitting ink)

the name of light-emitting ink has been introduced in previous books and periodicals, but today this article is very different from them, and its essence should be called light storage ink is more appropriate

light storage ink is made by adding a certain proportion of light storage materials to the raw materials of transparent ink and processing. The light storage material in ink adopts long afterglow luminescent material, which is a kind of material that emits visible light after absorbing sunlight or artificial light source, and can continue to emit light after excitation stops. It has the characteristics of using sunlight or light to store light, and emitting light at night or in the dark. It is an energy-saving luminous material. The long afterglow material does not consume electric energy, but it can store the light energy of the absorbed natural light, and presents bright and recognizable visible light in a darker environment. It has the function of illumination, indication and decoration. It is a "green" light source material. As mentioned earlier, it can also contain radioactive substances without external light sources, which can make it glow by radiation. Therefore, this kind of ink is also called self luminous ink. The radioactive energy source of luminous ink was natural uranium at first, and then artificial radioisotopes were used, but such ink has an impact on the environment or personnel safety. Light storing luminescent materials from aluminate system, silicate system and sulfide system, especially alkaline earth aluminate long afterglow materials activated by rare earth, have the characteristics of long-term cycle light storing and luminescence of light storing in the day and light emitting at night, and have a very wide application prospect

1. Composition of light storage ink

light storage ink is made of luminous pigments (light storage materials), organic resins, organic solvents and additives through special processing technology in a certain proportion. The selected resin should have good light transmittance, and the color of the resin has an impact on its luminous brightness, so the principle of selecting resin and varnish is colorless or light color, with good transparency. Because the light storage material is weak alkaline material, it is better to choose neutral or weak acid resin, and the small-scale mass production electroplating equipment has been built. The types of resins or varnishes selected are generally as follows: epoxy resin (E440), polyurethane resin, amino varnish, polyester resin, acrylic resin, hydroxyl acrylic resin, acrylic polyurethane varnish (two-component), alkyd varnish with light color, fluororesin, etc. If neutral transparent organic resin is selected, the particle size of light storage material should be controlled within the range of 45~65 microns, so as to produce practical light storage ink. Usually, different types of transparent inking oil are selected according to different substrates. If the substrate is metal, metal inking oil should be selected. If the substrate is PVC, PVC inking oil can be selected

(to be continued)

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