What are the requirements for colorants in inks?

What are the requirements for colorants in inks?

author: Uvink

2023-04-28

Colorants for inks include pigments and dyes. Pigments are divided into organic pigments and

inorganic pigments. Organic pigments have bright hues, strong coloring power, and short drying

time. They are widely used in inks. Colorants are the main components of inks. The color of inks

is determined by them. It can give inks Different colors and color concentrations, and make

the ink have a certain viscosity and dryness.

Different inks have different requirements for colorants, and gravure inks have requirements for

pigments. The soft body is light, will not wear the plate roller, bright and strong. It has good

affinity with binder and excellent color development. Good dispersion, and no condensation and

precipitation will occur during storage. It can exhibit good fluidity when dispersed in the link

material, and the fluidity will not deteriorate during storage. Requirements for dyestuffs. Bright

color, excellent light fastness, stable performance in solvents, no sublimation or oozing

out of the printed body.

Ink requirements for colorants, color The primary condition for selecting colorants when making

inks is bright, bright, saturated, glossy, and stable tones. The oil absorption refers to the ability of

the colorant to blend with the oil, which is generally expressed by two oil absorptions. The first

oil absorption is the amount of oil required when the colorant is made into a slurry; the second

oil absorption is the amount of oil required when a certain amount of colorant is made into an ink.

The oil absorption is closely related to the particle size, dispersibility, and wetting ability of

the colorant, and is also related to 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 oil absorption of the colorant is large, and the ink

concentration is not easy to increase, which is not conducive to the adjustment of ink property.