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The difference between dyes and pigment inks in UV inks

Shenzhen Aoxuan's excellent Xiao Bian thinks that the dye UV ink has better color reproduction ability, but the printed manuscript has poor waterproof, light resistance and anti-oxidation capabilities. After long-term preservation of photos, the fading phenomenon is likely to occur. However, the characteristics of the pigment ink are the opposite. The printed photos have better waterproof, light resistance, oxidation resistance, and preservation performance, but the color reproduction ability is slightly inferior.
      Why are there so many differences in the characteristics of the two inks? This has to start with its structure.
      The dye colorant in the dye ink is completely dissolved in the ink in a single molecule manner. The colorant particles are small and are easily dissolved in water or other chemical solvents. This structure makes it difficult for the dye ink to clog the nozzle. Even if it is blocked, clearing the nozzle is easier. However, the dye colorant of a dye ink has a large amount of hydrophilic particles and is easily dissolved. In this way, once the draft is in contact with water, the colorant originally fixed on the media will dissolve again and spread to the surrounding with the flow of water, causing serious smudging. This is the main reason why the dye ink has poor water resistance. At the same time, the colorant of the dye ink is directly exposed to air. Under the action of light, ozone, etc., the chemical chain of the dye colorant may be broken, resulting in discoloration of the colorant, etc., which causes the printed document to fade, thereby affecting its preservation performance.
      The structure of the pigment ink is the same, and the colorant is some small solid particles. In order to make these solid colorants evenly distributed in the ink, an emulsifier is added to coat the colorant with a special resin component, and the ink is emulsified by the small amount of hydrophilic particles on the resin layer. The colorant is suspended in the ink. . Since the colorant does not dissolve in water, when the printed draft meets water, the colorant does not migrate with water, and its water resistance performance is naturally greatly improved. The pigment ink colorant is generally a highly crushed mineral, its own stability is very good, plus the outer layer of the colorant wrapped with a resin layer, when it comes to sunlight and ozone, the first damage is the outer resin The layer, while the internal colorant is not affected, naturally not easily faded.
      Why dye ink's color reproduction ability will be better than pigment ink? This is mainly due to the different choice of colorants. For dye inks, after decades of development, the process is very mature, and it is very easy to use natural or synthetic methods to produce colorants of various colors. The traditional pigment inks rely on grinding minerals as colorants. The available raw materials are very limited, and the colors cannot be arbitrarily changed. This leads to the inherent deficiency of pigment inks in color performance. Although some colorants of pigment inks can be produced by grinding with some non-mineral materials, the pigment inks have strict requirements on the particle size and emulsification effects of the colorants, and the technical problems of the colorants have not yet been completely solved. This leads to a certain gap between the color performance of pigment ink and dye ink. Fortunately, this gap is already very small, and it is difficult to visually distinguish the color difference between high-quality pigment ink and dye ink without direct comparison.
Select compatible ink tips,
      Because pigment inks have excellent waterproofing and preservation properties, many consumers are interested in it, especially those who use the CISS system or do self-inking. However, to remind everyone that if your printer was originally using dye inks, it is necessary to be cautious when using pigment inks nowadays, especially if you use Canon, Hewlett-Packard and other printer users who use thermal bubble technology. This is mainly because the colorant in the pigment ink is some solid small particles having a particle diameter 50 to 100 times larger than the colorant molecules in the dye ink. With the rush of pigmented ink, the probability of clogging of the nozzle is bound to increase greatly, and the pigment ink has a waterproof characteristic, and the difficulty of clearing the nozzle is also relatively high. For HP and Canon printers that use thermal bubble technology, the high temperature and pressure during operation may damage the structure of the pigment ink, resulting in improper printing and even damage to the print head.
How to distinguish between pigment ink and dye ink at the time of purchase
      For bottled compatible inks, it can be distinguished by observing the ink in addition to the manufacturer's label at the time of purchase. Since the colorant in the dye ink is soluble, the dye ink is transparent in appearance. While the colorant in the pigment ink is insoluble and exists in the ink in a suspended state, the pigment ink is opaque from the appearance.


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