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English Views: 5 Author: CHERRY Publish Time: 2021-08-16 Origin: Site Inquire
Why choose ER pigments for solvent based ink?
1. What is solvent based ink?
Solvent-based ink refers to an ink system formed by using organic solvents or solvent-based polymer film-forming agents as a carrier and dispersing pigments or dyes in the carrier
2. Recommended pigments from ER CHEM for solvent based ink?
Product code | CI number | Product code | CI number |
61571-S1-26A | Pigment red 57:1 | 61482-SI-18A | Pigment red 48:2 |
61571-S1-26B | Pigment red 57:1 | 61482-SI-188 | Pigment red 48:2 |
61571-S1-26C | Pigment red 57:1 | 61571-SI-18A | Pigment red 57:1 |
61482-S1-26A | Pigment red 48:2 | 61571-S1-18B | Pigment red 57:1 |
61482-SI-26B | Pigment red 48:2 | 61146-SI-18 | Pigment red 146 |
6312-SI-26A | Pigment yellow 12 | 61184-SI-18 | Pigment red 184 |
6312-SI-26B | Pigment yellow 12 | 6313-SI-18 | Pigment yellow 13 |
6312-SI-26C | Pigment yellow 12 | 6314-SI-18 . | Pigment yellow 14 |
6314-SI-26A | Pigment yellow 14 | 6383-SI-18 | Pigment yellow 83 |
6314-SI-26B | Pigment yellow 14 | 65154-SI-18A | Pigment blue 15:4 |
65154 SI-18B | Pigment blue 15:4 |
3. The solvent based ink has the following requirements for colorants:
1 color
The primary conditions for selecting colorants when manufacturing inks are bright, bright, saturated, shiny, and stable in color.
2 tinting strength
The color strength depends on the colorant's own structure, preparation method, and dispersion performance. The coloring power of the colorant directly affects the performance of the ink. The coloring power is low, the amount of the colorant is large, and the solid content of the ink increases, which reduces the adjustable margin of ink performance, which is not conducive to the adjustment of ink properties.
3 Transparency and hiding power
Transparency refers to the degree to which the ink film transmits light after the colorant is formulated into an ink and then printed on paper or other materials to form a thin film. When the refractive index of the colorant in the color ink is approximately equal to the refractive index of the binder, it is a transparent ink.
Hiding power is the ability of the ink film containing colorants on the printed matter to cover the bottom layer. The greater the difference between the refractive index of the colorant in the color ink and the refractive index of the binder, the smaller the transparency of the ink and the stronger the hiding power.
4 gloss
Printed products require not only colorful, but also good gloss. The colorant of the same structure, the manufacturing conditions and processing technology are different, the gloss of the ink after the modulation is quite different.
5 Oil absorption
Oil absorption refers to the ability of the colorant to blend with oil, and is generally expressed in terms of two oil absorptions. The first oil absorption is the amount of oil needed when the colorant is made into a paste; the second oil absorption is the amount of oil needed when a certain amount of the colorant is made into ink. Oil absorption is closely related to the particle size, dispersion, and wetting ability of the colorant, as well as the water content of the colorant and the acidity of the oil, and is also affected by the lipophilicity, wettability, particle shape, and surface electrostatic properties of the colorant. And so on.
The colorant has a large oil absorption, and the ink concentration is not easy to increase, which is not conducive to the adjustment of ink properties.
6 Dispersibility
The dispersibility is generally related to the wetting ability of the colorant surface, the size of the surface area, the size of the crystal form, and the state of particle aggregation, which can reflect its dispersion in the bonding material. Dispersibility is related to the performance of the colorant.
7 Solubility
Organic pigments in inks generally have some solubility. It is not a good thing that pigments can be dissolved by solvents, especially plastic inks, where the pigments are easily soluble in the plasticizer and unreacted monomers in the plastic compounding agent. Lithographic inks will come into contact with water during printing, and soluble dyes cannot be used. Therefore, when making this type of ink, the pigment must be carefully selected.
8 fineness
The pigments used in inks must be very fine particles, mostly 0.02-0.05μm, with a specific surface area of 40-100㎡/g and large surface energy.
4. The advantages of ER CHEM colorants in solvent based inks.
1. Good solvent resistance (such as aromatic hydrocarbons, toluene, xylene, alcohols, ethanol, isopropanol, esters, etc.).
2. It has good compatibility with resin binder.
3. High tinting strength and easy dispersibility, no flocculation and precipitation.
4. The gloss is not reduced during storage, the color and light are stable, and the color does not change.
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