Influence of pigment on water-based UV curing inks

2022-05-16

As the composition of waterborne UV curing ink china-africa photosensitivity, pigment and absorb UV light initiator competition, to a great extent, it affected the curing characteristics of the UV curing system in the system Due to the pigments can absorb part of the radiation energy, it will affect the light initiator for the absorption of light, and, in turn, affect the ability to generate the concentration of free radicals, the result will reduce the curing speed All kinds of pigments have different absorption rate of light of different wavelengths (transmittance), the absorption rate of pigments is smaller, transmittance is larger, the curing speed of the coating is faster ultraviolet absorption capacity of carbon black is higher, curing is the slowest, white pigment is reflective, also hinder the curing of the general and uv absorption order is: Black> Purple>Blue>Cyan>Stunning>Yellow>Red.

The same pigment ratio concentration is different, the influence of ink film curing rate is different with the increase of the amount of pigment, the curing rate of the ink film has a different process of decline among which the amount of yellow pigment has the greatest influence on the curing rate of the ink film, by red pigment green pigment Because black has the highest absorption rate of ultraviolet light, the transmittance of black ink is the lowest, so the change of its dosage has no obvious effect on the curing rate of ink film When the amount of pigment is too large, the curing rate of the surface layer of the ink film is fast, but the pigment on the surface absorbs a lot of ULTRAVIOLET light, reduces the transmittance of ultraviolet light, affects the curing of the deep ink film, resulting in the curing of the surface layer of the ink film and the bottom layer is not curing, easy to produce wrinkling phenomenon.

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